View Full Version : DB840 sub in LSI15's replace the stock 8"driver!!!!!
TouchOfEvil
10-09-2009, 11:22 PM
Well i bought a single DB840 sub to try out this swap.
"only bought one in case this was a bust and did not improve the sound/work out."
Important thing to note if you plan to do this at any time you must remove the rubber seal around the DB840 in order for it to fit in the pre fabbed spot for the 8"driver. If you do not it will not fit.
This of course means you need to make your own gasket so get some mortite ready.
I have not done that step yet but will tomorrow.
Also if you plan to do this get new screws the old ones sheer off really easy trying to get the new sub to seal all the way. They are easy to snap like a twig trust me.
On to the speaker/seal, i currently do not have a seal to finish up the job. I will do this tomorrow but i had to listen to what the new driver had to offer even if it didn't have a true perfect seal. It isn't horrid but you can feel a little air leaking out at the moment so i will correct this once i get to the hardware store and get the good stuff.
Overall with the new driver the 15's can handle more volume/power instantly. Most likely due to the power handling of the new unit.
To me the stock unit did not go deep enough was kinda slow about things overall sloppy in general and i had to have a sub going to make me happy with them.
Note that my 15's have upgraded crossovers done by Ben with sonicaps already as well and this is how i feel about the stock bass driver even still.
If pushed to hard the stock sub would reach it's limit bottom out sometimes and always kinda had a resonant sound to it. Just not good.
The GOOD.
The DB840 has a vast improvement in bass reproduction. It is quite a bit faster plays much deeper without going out of control no longer has the same resonant sound the old driver seemed to produce and cleaned up the sloppy sound greatly!!
I am only running one atm because like i said i didn't want two of them in case it did not work out but, even with the single sub i can tell i will not be running a sub for 2 channel any longer.
With the new driver sitting in my chair i could feel the bass beating in my chest and feel the vibrations thru the floor in my feet as if a sub was running.
With two i would imagine the output would be very nice and " I placed an order for the second one before making this thread."
If you feel your 8" driver is your main displeasure in your LSI15's i suggest you try swapping them out with the DB840 single voice coil 4 ohm subs.
The difference is greatly noticed and a massive improvement to my ears.
The subs do not cost alot of money and they will tighten up the bass big time.
Using a test CD to sample bass notes for a hz vs hz comparison stock vs DB sub.
The DB sub was able to reproduce very livable bass down to 40hz and really comes alive 45hz and up with some intense spl for a 8inch driver.
The stock unit was able to reproduce livable bass down to 53hz and had average spl output at around 58hz.
This is of course being nice about livable for the stock unit as it falls short all over the board vs the DB sub. Also note the spl output for the stock is down across the entire board of HZ ranges and it is very noticeable for the entirety of a 120-20hz drop.
Doro told me about this swap so a BIG THANKS goes out to Doro for filling me in on this cost effective very worth while mod!!!!!
McLoki
10-10-2009, 03:41 AM
You have a "The Good" section, but no "The Bad" section.....
Any down side to the swap in your opinion? (other than the annoying gasket and screw issue that you mention).
Congrats on the upgrade. Wish you were closer so I could hear before the swap....
TouchOfEvil
10-10-2009, 12:00 PM
You have a "The Good" section, but no "The Bad" section.....
Any down side to the swap in your opinion? (other than the annoying gasket and screw issue that you mention).
Congrats on the upgrade. Wish you were closer so I could hear before the swap....
I guess i could have labeled the screw/gasket issue as THE BAD but i didn't think about it honestly.
Really as for performance there is no downside to the swap, it plays lower,deeper,louder,faster,lost the annoying resonant sound. It just really fills in the missing links in the low end for the 15's. I have about 20hours on the sub now "let it play all night" and it outperforms the stock by a huge margin.
If your not sure about the swap i would recommend getting a single sub from ebay like i did. I found it for 59.00 shipped. To me 59.00bucks isn't a big deal and worth the risk. Plus i already know how much better it sounds.:D
xcapri79
10-10-2009, 06:11 PM
Considering the price of the LSi15, this mod is relatively inexpensive.
Sounds like a winner.
TouchOfEvil
10-22-2009, 07:59 PM
Has anyone else gave the DB subs a go yet? Anybody plan too?
Personally i am in love with the 15's now that i have the new drivers in there.:D
I've been leaning on a local Polkie to try this. He already has upgraded crossovers, so this mod would make them even more impressive.
They're ordered.
I hope he doesn't bring them here for the upgrade, my ugly speakers are a little worried. :D
TouchOfEvil
10-22-2009, 10:06 PM
They're ordered.
I hope he doesn't bring them here for the upgrade, my ugly speakers are a little worried. :D
Lol, well i'm sure they will give some good impressions with the new drivers.
I have not used my sub since i got em swapped out and before i used the sub all the time.
vmaxer
10-22-2009, 10:19 PM
Lol, well i'm sure they will give some good impressions with the new drivers.
I have not used my sub since i got em swapped out and before i used the sub all the time.
Have you upgraded both speakers now?? If so, how do they sound and compare?? I still have a set that have no mods at all and am trying to decide if I want to play with them or sell them. I haven't used them much at all due to getting the 1.2tl's shortly after getting the LSi's...
This is tempting.
A modded pair of LSi15's are more coherent and have more resolution than SDA's, but they'll never have the SDA soundstage.
TouchOfEvil
10-22-2009, 10:44 PM
Have you upgraded both speakers now?? If so, how do they sound and compare?? I still have a set that have no mods at all and am trying to decide if I want to play with them or sell them. I haven't used them much at all due to getting the 1.2tl's shortly after getting the LSi's...
This is tempting.
Yes, i have had the two drivers replaced for a good while now.I also have them running on a Adcom 555 atm as i got one for a nice price a little while back and wanted to see how it sounds vs the Rotel unit.
The 15's have really come alive compared to stock, everything in the low range is fuller,faster and they can play alot deeper not to mention they are louder as well. To replace both drivers it is not at all expensive once you find em on ebay with free shipping. The cost for this mod is very doable and VERY worth while.
camtah
10-26-2009, 11:50 AM
I noticed that your crossovers were modified. Has anyone done this mod on the stock crossover and noticed a significant improvement? I love my LSi15, but do find the bass a bit "reserved" despite all of my efforts on placement and room treatments. Mind you I am not unhappy. I just want to be it to go to "11" :D
TouchOfEvil
10-26-2009, 09:28 PM
I noticed that your crossovers were modified. Has anyone done this mod on the stock crossover and noticed a significant improvement? I love my LSi15, but do find the bass a bit "reserved" despite all of my efforts on placement and room treatments. Mind you I am not unhappy. I just want to be it to go to "11" :D
I'm not sure if anyone has done the mod here. I searched a little and noone really mentioned having done it.
Even if you are using the stock crossovers the new subs will still outperform the stockers. They are just way better subs, so even with a stock crossover you should hear some big changes with the new drivers.
I'm not sure if anyone has done the mod here. I searched a little and noone really mentioned having done it.
Even if you are using the stock crossovers the new subs will still outperform the stockers. They are just way better subs, so even with a stock crossover you should hear some big changes with the new drivers.
http://www.polkaudio.com/forums/showthread.php?t=85058
I should be getting my ears on a pair of hot rodded LSi15's with DB woofers soon.
TouchOfEvil
10-26-2009, 09:38 PM
http://www.polkaudio.com/forums/showthread.php?t=85058
I should be getting my ears on a pair of hot rodded LSi15's with DB woofers soon.
Sweet, when are the woofers arriving? You should notice a pretty big difference right away. I know i did.:)
I'm not sure, I have to get in touch with the owner.
chamont
11-05-2009, 03:15 PM
Hi there.
I ordered a couple of DB840's the other day. I'm looking around for Mortite, but can't find it. Where would you recommend I look for it? Home Depot, Wal-Mart? Or just online? Thanks... Looking forward to the upgrade.
Hi there.
I ordered a couple of DB840's the other day. I'm looking around for Mortite, but can't find it. Where would you recommend I look for it? Home Depot, Wal-Mart? Or just online? Thanks... Looking forward to the upgrade.
HD or Lowes.
chamont
11-08-2009, 08:28 PM
Ok. So I replaced the drivers this afternoon.
Immediately, I noticed the extra depth on two channel music. That was nice. But it was really tight. I'm pretty sure it's because of the drivers being new. So I'm running music through them today to break 'em in. The extra depth was obvious, but kick drums felt a little too tight. Bass notes extended nicely, but they felt dry. Maybe it's also partly because I'm used to the old sound. I'm sure that will get better in time. On movies, even this early, the new drivers really come to life. Of course, I have a sub along with the LSi15's, but the entire sound felt fuller and more balanced. Also, it has more punch. I'm watching Taken right now (which I've seen before), and I love the sound.
Incidentally, I do NOT have upgraded capacitors. Well, not YET. I ordered Ninja Master networks the other day from Skiing Ninja. I'm really excited for them to get here. But he says it takes up to a couple of months. So I'm not holding my breath.
Also, I never did find Mortite brand anything locally. HD, Lowes, or Ace. I found some "generic" tape caulk. It's a little too thick. When I pull out the drivers to upgrade the networks, I'll cut it in half before reapplying it. It does make a nice seal though, and I really like it.
So, even early on, before the drivers have really broken in yet, I'd say this upgrade is a no-brainer.
TouchOfEvil
11-08-2009, 09:36 PM
I'm glad you are enjoying the upgrade. I did let the driver break in a bit before i really gave it a listen, then when i got the second one in i let them both play for a couple days before i listened again.
In the end i'd say they are finally broken in after a good 100hours on them give or take a few hours.
At this point i do not use my sub for music anymore. I run it for HT and HT alone now. I simply don't need the extra bump as i get plenty with the new drivers.:cool:
On the mortite i tried HD and they didn't have a clue as to what i was talking about. I ended up going to a local mom and pop hardware/automotive store and they had it. Maybe try small hardware stores in your area.
TouchOfEvil
11-08-2009, 09:37 PM
I also got a pair of the PNF symphony cables and have let them break in all weekend. Before i was running DH Labs Q-10 cables.
The bass a bit heavier than before so much that i thought i had the sub on and had to look for the little blue light a couple times.
The mids seem more forward and controlled. The highs are not as bright though and seem to be a little bottled up so to speak.
So to remedy this i am using my DH Labs Q-10 jumpers, running the PNF to the mids/bass and the DH Labs jump to the highs. This little bit of wire changed the highs by a large margin. They are not AS bright as before but have a nice sparkle to them and they are no longer bottled up sounding. To me i am loving the setup with the new cables while using my old jumpers.:)
BTW:Face have you swapped out the drivers on your friends 15's yet? Impressions?
PSOVLSK
11-09-2009, 12:43 AM
FYI: Crutchfield has these buy one get one 1/2 price. Total is about $120 plus shipping. Maybe not the best price, but my experience with Crutchfield has been positive. They also have them "open box" for about $110. I'm very tempted to pull the trigger on this upgrade.
TouchOfEvil
11-09-2009, 01:20 AM
FYI: Crutchfield has these buy one get one 1/2 price. Total is about $120 plus shipping. Maybe not the best price, but my experience with Crutchfield has been positive. They also have them "open box" for about $110. I'm very tempted to pull the trigger on this upgrade.
That is a good price. Best i found on ebay was 59.00 each shipped. With Crutchfield you would have a little more peace of mind for the same price IMO.
McLoki
11-09-2009, 03:40 AM
Do you think you would notice much difference in movies even with an 80hz crossover? (or would it not be worthwhile with a crossover set that high?)
xcapri79
11-09-2009, 07:38 AM
I did this crossover a couple of weeks ago and was not immediately impressed either way.
More time is needed to let the new woofers break in.
After the conversion, my SPL actually showed a -3dB drop measured several times compared with some base line measurements I previously made.
This was based on listening to some ZZ-Top and not on test tones so it wasn't particularly scientific.
I'm interested in knowing whether others made some measurements.
TouchOfEvil
11-09-2009, 08:03 PM
Do you think you would notice much difference in movies even with an 80hz crossover? (or would it not be worthwhile with a crossover set that high?)
Really not sure, you might get some double bass with it that high.
I did this crossover a couple of weeks ago and was not immediately impressed either way.
More time is needed to let the new woofers break in.
After the conversion, my SPL actually showed a -3dB drop measured several times compared with some base line measurements I previously made.
This was based on listening to some ZZ-Top and not on test tones so it wasn't particularly scientific.
I'm interested in knowing whether others made some measurements.
I didn't use a spl meter when testing mine. I used my ears instead, it was a big enough jump to cause some excessive rattle in my room with the new drivers that i had to fix as it was annoying. I never had the rattle before.
It was also very apparent to my GF who could careless about my stereo gear but she instantly said "What did you do?"
I ask what you do you mean and her response was it has so much more bass now, is the sub on?
Of course my response was no the sub is off but i replaced the woofers in the lsi15's, then she rolled her eyes at me lol.
What amp are you using to push the 15's? Also you might want to play with placement. After a few days i ended up moving mine away from the side walls about a half foot to get the sound how i like it.
After the conversion, my SPL actually showed a -3dB drop measured several times compared with some base line measurements I previously made.
This was based on listening to some ZZ-Top and not on test tones so it wasn't particularly scientific.
I'm interested in knowing whether others made some measurements.
That's a pretty poor testing method. You know, room EQ Wizard is free right?
PSOVLSK
11-10-2009, 11:05 PM
I remembered I had a $50 gift card from Crutchfield, so that made my decision pretty easy. Less than $70 shipped for 2 subs:D:D
TouchOfEvil
11-10-2009, 11:18 PM
I remembered I had a $50 gift card from Crutchfield, so that made my decision pretty easy. Less than $70 shipped for 2 subs:D:D
nice.:cool:
chamont
11-10-2009, 11:23 PM
I remembered I had a $50 gift card from Crutchfield, so that made my decision pretty easy. Less than $70 shipped for 2 subs:D:D
Excellent! Let us know what you think once you get them installed.
PSOVLSK
11-18-2009, 04:37 PM
Important thing to note if you plan to do this at any time you must remove the rubber seal around the DB840 in order for it to fit in the pre fabbed spot for the 8"driver. If you do not it will not fit.
I got mine in on Monday and hooked them up, but I must have done something wrong. I forgot about removing the rubber gasket, but it stills seems to fit just fine. I moved my hand all around each driver and I don't seem to be losing any air. Should I just leave well enough alone, or should I go back in and remove the rubber seal and make my own gasket? Also, did you guys use screw in every hole in the new driver or just use the screw you took out of the old driver?
Haven't had a chance to break it in and really crank it up, but the bass at lower volume levels does seem to be improved. Maybe it's just that way because it's what I want to hear, but it does seem tighter and deeper.
Thanks for your help guys. I'm hopeful that this will be one of my best and least expensive mods.
chamont
11-18-2009, 05:03 PM
I'm surprised you even got it in the cabinet with that thick piece of rubber around the speaker. :) It's probably fine as-is. Personally, I'd take the rubber thing off.
I just used the existing four screw holes in the cabinet, and left the other four on the woofer empty. Using all eight seemed total overkill.
TouchOfEvil
11-18-2009, 06:32 PM
I got mine in on Monday and hooked them up, but I must have done something wrong. I forgot about removing the rubber gasket, but it stills seems to fit just fine. I moved my hand all around each driver and I don't seem to be losing any air. Should I just leave well enough alone, or should I go back in and remove the rubber seal and make my own gasket? Also, did you guys use screw in every hole in the new driver or just use the screw you took out of the old driver?
Haven't had a chance to break it in and really crank it up, but the bass at lower volume levels does seem to be improved. Maybe it's just that way because it's what I want to hear, but it does seem tighter and deeper.
Thanks for your help guys. I'm hopeful that this will be one of my best and least expensive mods.
If it's not leaking any air i'd leave it alone. I couldn't even get mine to setup with the rubber seal, guess your better at this stuff than i am lol.
Anyway i used 8 screws simply because i had them. If your not leaking any air then i see no reason to worry about it as the 4 screws should do the job.
PSOVLSK
11-18-2009, 08:49 PM
If it's not leaking any air i'd leave it alone. I couldn't even get mine to setup with the rubber seal, guess your better at this stuff than i am lol. Not a chance of that:D
Anyway i used 8 screws simply because i had them. If your not leaking any air then i see no reason to worry about it as the 4 screws should do the job.
With me being not very handy and two of you saying you had to take the rubber seal off, I took the rubber seal off.
Doesn't seem to have made a difference, but I certainly feel better about it.
TouchOfEvil
11-18-2009, 09:04 PM
With me being not very handy and two of you saying you had to take the rubber seal off, I took the rubber seal off.
Doesn't seem to have made a difference, but I certainly feel better about it.
Did you use mortite when you installed them? If so it could explain it not leaking any air even with it on. Otherwise no idea.
PSOVLSK
11-18-2009, 09:31 PM
Did you use mortite when you installed them? If so it could explain it not leaking any air even with it on. Otherwise no idea.
No, I haven't found any yet. I can't tell that I'm leaking any air, but I'm still going to get some and use it just for peace of mind.
Thanks for the heads up on this mod and for your great write up about your experience. I think I'm going to be very happy with the end results once they're broken-in.
chamont
11-19-2009, 02:34 PM
Last night I started pulling my drivers out to install No Rez (http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=103) to the inside of my case.
Earlier in this thread I mentioned that I couldn't find Mortite, so I got some generic "tape caulk" from Lowes. So last night I unscrewed my new DB840, but that sucker was glued in there so tight that I couldn't get it out!
Holy **** (are we allowed to cuss on this forum?) I thought.
So I let it sit face down overnight, hoping that the weight of the driver would pull it away from the cabinet. Luckily, it did come out some time during the night. But now I have a huge mess of caulk all around the rim of my cabinet. Ugh.
In hindsight now, I think I should have used the thin rubber gasket that was on the old driver. I'm not sure about Mortite, but the stuff I used is pretty much the same as using caulk in a bottle. It's strong.
FYI....
Mortite wouldn't do that.
PSOVLSK
11-19-2009, 04:28 PM
Last night I started pulling my drivers out to install No Rez (http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=103) to the inside of my case.
Earlier in this thread I mentioned that I couldn't find Mortite, so I got some generic "tape caulk" from Lowes. So last night I unscrewed my new DB840, but that sucker was glued in there so tight that I couldn't get it out!
Holy **** (are we allowed to cuss on this forum?) I thought.
So I let it sit face down overnight, hoping that the weight of the driver would pull it away from the cabinet. Luckily, it did come out some time during the night. But now I have a huge mess of caulk all around the rim of my cabinet. Ugh.
In hindsight now, I think I should have used the thin rubber gasket that was on the old driver. I'm not sure about Mortite, but the stuff I used is pretty much the same as using caulk in a bottle. It's strong.
FYI....
This might be reason enough for me to leave well enough alone:p
But based on Face's post, maybe not.
TouchOfEvil
11-19-2009, 07:32 PM
Mortite is very easy to work with and nothing like you mentioned in a tube.
It's a solid but workable and does a great job.
Of course if you don't have any air leaks you can always just go with it i guess.
On mine i could feel and hear the leaks so i had to use the mortite on them.
PSOVLSK
12-07-2009, 01:25 AM
I've had pretty much the same experience as the others who have posted about this mod. Deeper, tighter bass. Nothing earth shattering, but a very nice improvement...especially for the price I paid.
dorokusai
12-12-2009, 09:38 AM
Glad to hear you're having fun TOE. I mentioned this mod a couple years ago but nobody paid attention so I just stayed in my own little world.
m00npie
12-12-2009, 09:47 AM
Glad to hear you're having fun TOE. I mentioned this mod a couple years ago but nobody paid attention so I just stayed in my own little world.
I listened... I was just too lazy to do it.
TouchOfEvil
12-12-2009, 12:55 PM
Glad to hear you're having fun TOE. I mentioned this mod a couple years ago but nobody paid attention so I just stayed in my own little world.
I'm glad you mentioned it again when you did. This was a nice easy mod and with a low price tag to boot. Very worthwhile IMO. Thanks for the heads up again.
tcrossma
01-19-2010, 11:21 AM
I've never opened up my LSi15's (or really any speaker, for that matter). What specifically is involved in changing out these drivers?
PSOVLSK
01-21-2010, 01:23 AM
Preface: This answer is coming from a guy who wants to upgrade the XO's in my 15's, but I'm afraid of messing something up. In other words, I'm no handyman, electrician, etc.
This is an EASY mod.
1) Lay the speaker on it's side, woofer side up.
2) Take off the woofer grill, speaker cover, whatever you want to call it. (This was arguably the hardest part for me).
3) Unscrew the 4 screws holding in the woofer
4) Unhook the internal wires connected to the woofer and take the woofer out.
5) Hook the wires you just unplugged to the dB840.
6) Drop the dB840 in the opening. (Don't forget to take off the gasket and add mortite)
7) Screw in the new woofer (Not too tight though or you'll break off the screw)
8) Replace the woofer grill.
9) Set speaker back upright and enjoy. But realize you'll be more impressed in a few weeks when they start to sound even better.
Others who have done this, did I leave anything out?
mantis
01-21-2010, 06:44 AM
I'd love to hear a pair after all the upgrades. They are excellent speakers before you crack them open. The bass was always the problem on the 15's. It's not out of control for what you pay for the 15's it's an except able flaw.
ohskigod
01-21-2010, 10:40 AM
hmmmm, how the hell did I miss this? I might try this, perhaps a project at Polkfest this year, I have a pair of 15's. I love how they sound so I never think of modding them, but i usually trust Doro's judgement in these audio things (though not for much else :) )
tcrossma
01-21-2010, 10:44 AM
Preface: This answer is coming from a guy who wants to upgrade the XO's in my 15's, but I'm afraid of messing something up. In other words, I'm no handyman, electrician, etc.
This is an EASY mod.
1) Lay the speaker on it's side, woofer side up.
2) Take off the woofer grill, speaker cover, whatever you want to call it. (This was arguably the hardest part for me).
3) Unscrew the 4 screws holding in the woofer
4) Unhook the internal wires connected to the woofer and take the woofer out.
5) Hook the wires you just unplugged to the dB840.
6) Drop the dB840 in the opening. (Don't forget to take off the gasket and add mortite)
7) Screw in the new woofer (Not too tight though or you'll break off the screw)
8) Replace the woofer grill.
9) Set speaker back upright and enjoy. But realize you'll be more impressed in a few weeks when they start to sound even better.
Others who have done this, did I leave anything out?
Thanks for the directions. I'm having a heck of a time getting the grills off to even look around, but otherwise it sounds very easy to do. I might give it a shot.
PSOVLSK
01-21-2010, 12:17 PM
...I'm having a heck of a time getting the grills off to even look around...
Honestly, it's probably the most difficult part of the whole process.
I'd like to hear how others got the grill off. I hate to admit this, but I used an ice pick...VERY carefully. I worried about snagging the material, but I didn't. The only problem is that I got a couple of very small little scratches on the speaker. Probably only noticable to me, but it still iritates me a little.
tcrossma
01-21-2010, 01:25 PM
The only problem is that I got a couple of very small little scratches on the speaker. Probably only noticable to me, but it still iritates me a little.
That's what I'm afraid of doing, which is probably why I'm having a hard time with it. I just can't seem to get any grip on the grill without also touching the wood panel, which risks marking it up. But I'm going to spend some more time on it soon and be a little more patient and see if I can make some progress.
domflane
01-22-2010, 02:44 PM
Anyone have pictures of one of these upgrades? I would love to see what the DB's look like in that beautiful LSi cabinet. Also, a friend of mine has 15's and I could encourage him to rtry this upgrade/
xcapri79
01-22-2010, 03:11 PM
That's what I'm afraid of doing, which is probably why I'm having a hard time with it. I just can't seem to get any grip on the grill without also touching the wood panel, which risks marking it up. But I'm going to spend some more time on it soon and be a little more patient and see if I can make some progress.
I used the pointed ends of a pair of larger plastic ty-wraps. I slipped them in on the edges and eased out the grille fairlly easily. The plastic won't mark the wood or damage the grille.
Jason_k
01-27-2010, 11:01 AM
I just bought a set of LSI 15's for Music and got to say I love them. But as like most I find the bass a little lacking, got my hand on the trigger to do this mod, just wondering about this mortite stuff, any links for this product? pics of this installion floating around?
Thanks
TouchOfEvil
01-27-2010, 04:20 PM
Not sure of any links for the mortite, i found mine a my local hardware store. As for pics of the install i did not take any but it's so easy you really do not need them.
If i get some spare time i may take the cover off this weekend and snap a pic of the new driver in there.
Jason_k
01-27-2010, 04:51 PM
That would be great TouchEvil if its not too much trouble. Going to take a look in the hardware store tonite, its used for weather stripping right?, thats all google came up with. Also if i didn't I like the mod would it be easy to change back with the mortite on it.
Thanks
Just order the speakers, could't resist!
PSOVLSK
01-27-2010, 08:12 PM
Also if i didn't I like the mod would it be easy to change back with the mortite on it.
I don't think you'll have to worry about that. Give it time though. I think if the improvement I have now would have been immediate, I would have considered it significant. I'd love to hear a stock pair vs. a pair that's had the new sub for a while.
TouchOfEvil
01-27-2010, 11:04 PM
That would be great TouchEvil if its not too much trouble. Going to take a look in the hardware store tonite, its used for weather stripping right?, thats all google came up with. Also if i didn't I like the mod would it be easy to change back with the mortite on it.
Thanks
Just order the speakers, could't resist!
Yes it would be easy to go back. The woofer would have a tighter seal and a little tougher to get out but you can do. I know because i pulled one after the fact and it was no big deal.
Just remember to give the new woofers some break in time. It makes a big difference as you get more and more hours on them.
tcrossma
02-01-2010, 09:05 PM
I used the pointed ends of a pair of larger plastic ty-wraps. I slipped them in on the edges and eased out the grille fairlly easily. The plastic won't mark the wood or damage the grille.
Does anyone have any other suggestions on how to get the grills off? Honestly, I've tried just about everything. There's zero space around the edge of the grill to slide anything in there, and the grill doesn't stick up enough to pry it off. I've tried just about everything short of cutting the cloth, tearing the cover off, and ordering two new ones. These grill covers are just on too damn tight!
http://img704.imageshack.us/img704/9673/istockphoto7043008squee.jpg (http://img704.imageshack.us/i/istockphoto7043008squee.jpg/)
:D
hoosier21
02-01-2010, 10:50 PM
I just bought a set of LSI 15's for Music and got to say I love them. But as like most I find the bass a little lacking, got my hand on the trigger to do this mod, just wondering about this mortite stuff, any links for this product? pics of this installion floating around?
Thanks
http://www.conservationmart.com/p-81-mortite-45-foot-gray-rope-caulk-f-4.aspx
try a little google in your life :)
PSOVLSK
02-01-2010, 11:11 PM
Does anyone have any other suggestions on how to get the grills off? Honestly, I've tried just about everything. There's zero space around the edge of the grill to slide anything in there, and the grill doesn't stick up enough to pry it off. I've tried just about everything short of cutting the cloth, tearing the cover off, and ordering two new ones. These grill covers are just on too damn tight!
No other suggestions, but the good news is that if you ever get them off, the hard part is out of the way:p The fact that it's so hard to get off is the main reason I haven't posted any pictures as has been requested.
dorokusai
02-01-2010, 11:13 PM
I removed mine with a set of "dental" picks from Home Depot. I've found them multi-useful for many things audio. You just need to grab an edge, start from the bottom, pull lightly and work around.
The frame is plastic so its ok to dig as opposed to using the actual loudspeaker as leverage. It's real easy to damage the speaker and less expensive to replace the grill.
jacob.simpson
02-02-2010, 12:35 AM
Photos please, stock vs modded ...
TouchOfEvil
02-02-2010, 12:40 AM
Photos please, stock vs modded ...
Honestly, it doesn't even matter that much unless you plan to run with your side covers off once you do the upgrade.
Even then it's as simple as looking at a DB sub from polk in order to know how it will look.
PSOVLSK
02-02-2010, 10:58 AM
Photos please, stock vs modded ...
The fact that it's so hard to get off is the main reason I haven't posted any pictures as has been requested.
Honestly, it doesn't even matter that much unless you plan to run with your side covers off once you do the upgrade.
Even then it's as simple as looking at a DB sub from polk in order to know how it will look.
If I thought pictures would help, I would take the time and effort to take them, but as ToE said, all it would show is a LSi15 with a DB sub in it.
love2listen
02-03-2010, 09:58 PM
I was wondering if anyone had done this mod using a different brand of sub, such as a JL sub?
Please don't pick a random driver to install in a LSi15.
tcrossma
02-04-2010, 07:05 PM
Well, I've tried everything I can to remove the damn grills, and no luck. Those things are just stuck in there. I ordered two new drivers and 1 replacement grill thinking that I'd ruin at least one during the process, but in retrospect I should have ordered 2 because I have no choice but to just cut the cloth and yank the covers off. I'll report back once I get the new drivers installed.
You tried the aforementioned pick?
kcoc321
02-04-2010, 07:58 PM
before you cut, have you tried a plastic putty knife? The grill on my PSW350 was very tight, when I first got it, and I actually thought it didn't come off, until I saw some pictures with it off. That's what worked for me, but then I have never tried on a LSi, but they look the same.
FWIW, the pegs/ tabs 'should' be at the 4 diagonal points, like 10oc, 2oc, 4oc, 8oc. Again, on mine, but that is logical. Good luck.
tcrossma
02-04-2010, 08:51 PM
I tried a pick, I tried the zip ties, I tried a very thin screw driver, I tried a nail, I tried tweezers. I haven't tried a putty knife, because I don't see how it would work. I can barely fit the zip ties in around the edges of the grill, and there's so little of the grill sticking up (maybe 1/8") that I can't get anything to grip it. I don't want to damage the wood cabinet, and since the replacement grills are $12, I don't really have a problem with cutting them if that's what's needed.
I've tried using my hands to grip the inside of the grill (stretching the cloth a bit), and while I can get a pretty good hold on the plastic perimeter, I can't pull it out. In other words, it's stuck in there! If after I cut the cloth I found they were glued on, I wouldn't be surprised. I'm sure they're not, but I literally can't make them even budge a little bit.
xcapri79
02-05-2010, 12:49 AM
I tried a pick, I tried the zip ties, I tried a very thin screw driver, I tried a nail, I tried tweezers. I haven't tried a putty knife, because I don't see how it would work. I can barely fit the zip ties in around the edges of the grill, and there's so little of the grill sticking up (maybe 1/8") that I can't get anything to grip it. I don't want to damage the wood cabinet, and since the replacement grills are $12, I don't really have a problem with cutting them if that's what's needed.
I've tried using my hands to grip the inside of the grill (stretching the cloth a bit), and while I can get a pretty good hold on the plastic perimeter, I can't pull it out. In other words, it's stuck in there! If after I cut the cloth I found they were glued on, I wouldn't be surprised. I'm sure they're not, but I literally can't make them even budge a little bit.
I believe the issue is new LSi15's vs the older ones. I own 2 pair of the old types and 2 pair of the new LSi15's. It is easy to remove the grills off the old ones, but the grilles are stuck on the new ones. I modified one pair of the old type but left the rubber gasket on the DB840's.
tcrossma
02-11-2010, 11:50 AM
Ok, so the new drivers arrived and I'm working on trying to get them installed. I got one of the grill covers off, but I had to poke a couple small holes in the cloth to do it. Let me tell you, those grills were on there TIGHT. No chance I could have removed it without damaging it.
Now, I'm trying to remove the driver. Any tips there? Took the screws out, and it doesn't want to budge. There's nothing to grip onto it in order to pull it up and out, and really nothing to get any leverage on to pry it either. I currently have the speaker lying on the floor, upside down, hoping the weight of the driver will help it fall out.
I tried removing the crossover, but there is no play in the wires so I can't even remove it far enough to reach my hand in and push the driver from the back.
Anyone have any thoughts?
I currently have the speaker lying on the floor, upside down, hoping the weight of the driver will help it fall out. Give it some time, it will.
I tried removing the crossover, but there is no play in the wires so I can't even remove it far enough to reach my hand in and push the driver from the back.
IIRC, even if you do remove the crossover, you would need some really small arms and hands to reach the back of the driver.
tcrossma
02-11-2010, 01:45 PM
I let it sit for about 30 minutes, and it still wasn't even a little loose. So what I did is take the base off, then insert a stick up the port so I could push the driver from the back. Worked great. One speaker down, one to go.
dorokusai
02-11-2010, 04:24 PM
While you have the driver removed, dampen the port with rubber mastic, dynamat or similar material. I popped my driver out when I removed the crossover, also from the rear.
love2listen
02-11-2010, 05:41 PM
tcrossma,
Are you using the DB840 as the replacement driver? Do you know if the MM840 is an option for this mod or is there something about it that would not allow it to work well. Has anyone else conidered using the MM840?
tcrossma
02-11-2010, 05:42 PM
While you have the driver removed, dampen the port with rubber mastic, dynamat or similar material. I popped my driver out when I removed the crossover, also from the rear.
I had already finished, but could pop them back out at some point once I get some dynamat. What type of improvement is it supposed to make? And where should I apply it, on the driver itself or just stuffed in the port?
Thanks for the help everyone. So far it sounds excellent, and I expect that it will get even better as they break in.
dorokusai
02-11-2010, 08:57 PM
I said dampen the port, not stuff it. You wrap it around the port itself since it's just a cardboard tube.
PSOVLSK
02-11-2010, 10:39 PM
...I expect that it will get even better as they break in.
Yes. Yes it will.
Sorry to hear you had so much trouble. As xcapri79 said, it must have something to do with older vs. newer model.
love2listen: I don't know about the other driver you mentioned.
TouchOfEvil
02-11-2010, 11:12 PM
tcrossma,
Are you using the DB840 as the replacement driver? Do you know if the MM840 is an option for this mod or is there something about it that would not allow it to work well. Has anyone else conidered using the MM840?
I think the MM840 is meant more for a sealed use. The lsi15's are ported.
McLoki
02-12-2010, 02:57 AM
tcrossma,
Are you using the DB840 as the replacement driver? Do you know if the MM840 is an option for this mod or is there something about it that would not allow it to work well. Has anyone else conidered using the MM840?
The MM840 is about 5db more efficient than the DB840 (90 vs 85db efficient). I would guess that the MM840 may make the speaker a little to bass heavy.Supposedy the enclosure size and porting in the LSi15 is just about right for the DB840 as well.
The DB840 was not designed to work as a replacement for the LSi15 woofer, but it seems to be a very good environment for it. (from a size, porting and required efficiency standpoint).
I do plan to do this mod to my 15's, and will be using the DB840 when I do. (rather than the potentially less ideal MM840)
Michael
tcrossma
02-12-2010, 07:11 AM
I said dampen the port, not stuff it. You wrap it around the port itself since it's just a cardboard tube.
Ah ok, thanks. I think I misunderstood what you meant before. This speaker mod stuff is a bit new to me :)
Jason_k
02-15-2010, 08:06 PM
Here are a few pics I took when I done this MOD. I bought the chaulking Tape at the hardware store, couldn't find any of the brand names mentioned here, but it seemed to do a good job.
I'am happy with the Mod so far. Maybe Crossovers next? going to give this a little time first.
tcrossma
02-15-2010, 08:21 PM
Interesting. The driver didn't fit that snugly into my LSi15 opening -- it was smaller in diameter than the previous driver. I'd say there was a good 1/4" space around the edge. I put some mortite under the edge of the driver and it seemed to make a nice air tight seal, but it definitely didn't fit as snugly as yours.
Jason_k
02-15-2010, 08:35 PM
That is interesting, I bought them off a reputable(if there is such a thing) dealer on flea bay. They say DB840 on the box, I didn't check on the speaker. Once I took off the rubber gasket they came with, they fit very snug. Holes line up perfectly
TouchOfEvil
02-15-2010, 08:57 PM
Mine were also a nice snug fit. They would not drop in with the rubber seal on there for me.
tcrossma
02-15-2010, 09:07 PM
I didn't have to remove anything on my drivers -- there was nothing to remove, as far as I could tell. I had read about people needing to remove the rubber gasket, but mine either didn't need it removed or it didn't have it in the first place.
Now I'm getting concerned about why mine isn't the same as everyone else's seems to be...
dorokusai
02-15-2010, 09:09 PM
Mine was also snug.
Jason, the xover upgrade shouldn't be taken lightly as it's a serious project....not just a matter of snipping a couple leads and popping on new parts like an SDA xover.
Jason_k
02-15-2010, 09:40 PM
I appricate the warning, I have looked at what ben62670 has done. I have experience in soldering electronics and such. But this is definitely in a different league all together than the sub change out. To be honest I think the LSI15 sound just great to me, so i'am not sure I'll ever go down that path
PSOVLSK
02-15-2010, 09:50 PM
Mine was also snug.
Jason, the xover upgrade shouldn't be taken lightly as it's a serious project....not just a matter of snipping a couple leads and popping on new parts like an SDA xover.
Exactly the reason I haven't gotten up the nerve to try it. I would love to hear a pair of 15's that didn't "suck" though:p:D
This disaster is a point to point LSi15 crossover, before I secureed and neatened things up. Fortunately, it sounds a lot better than it looks. :D
http://face.cleanandquiet.com/store/LSi15%20Crossover%20After.jpg
Jason_k
02-16-2010, 11:01 AM
Face This disaster is a point to point LSi15 crossover, before I secureed and neatened things up. Fortunately, it sounds a lot better than it looks.
Looks great!
cokewithvanilla
03-03-2011, 02:24 PM
Has anyone done something like this to the 25's?
DVOuSS
03-03-2011, 04:08 PM
i second that question...i feel that the subs are the weakest link in the 25s
EndersShadow
04-06-2011, 05:24 PM
Hate to revive a mostly dead thread, but curious as to if any of you guys think adding dynamat to the sub would be worth the effort? Also how many of you dynamatted the powerport tube inside the tower?
jon s
04-07-2011, 03:42 PM
ignore this...
dorokusai
04-07-2011, 05:48 PM
Hate to revive a mostly dead thread, but curious as to if any of you guys think adding dynamat to the sub would be worth the effort? Also how many of you dynamatted the powerport tube inside the tower?
The Dynamat suggestion was also suggested to me from the Polk Engineering department and part of what I originally posted here on the forum. I used simple weatherproofing mastic to dampen my tube but Dynamat would work just as well.
EndersShadow
04-07-2011, 06:18 PM
The Dynamat suggestion was also suggested to me from the Polk Engineering department and part of what I originally posted here on the forum. I used simple weatherproofing mastic to dampen my tube but Dynamat would work just as well.
Thanks. I might do that since its pretty easy once you have it opened up anyway. That and I am buying about 36 sq ft of it for my car around the same time, so I might have some left over :wink:
love2listen
04-07-2011, 07:43 PM
I put dynamat on the tube and on the basket of the new sub and it did make a difference, to my ears!!
dorokusai
04-07-2011, 07:47 PM
I wouldn't be so concened with the basket on the dB series woofer since it's a car subwoofer and more rigid than the stock driver but it's easy enough to handle while it's all torn apart.
EndersShadow
04-07-2011, 08:00 PM
I wouldn't be so concened with the basket on the dB series woofer since it's a car subwoofer and more rigid than the stock driver but it's easy enough to handle while it's all torn apart.
Any other secrets from the Polk Engineering department you can share without killing me afterward :eek::biggrin::tongue::wink:. Related to the LSi series of course lol
Jer.War
04-08-2011, 09:40 AM
I have also swapped the stock subs in the LSI15s for the DB series with satisfying results (figured I would ad my 2 cents). I did notice the basket on the DB subs were quite sturdy, but I also had a ton of dynamat hangin around so I figured what is the harm?? I also put a layer on the base (underside) of the LSIs, as well as the bass tube (the cardboard does benefit from so dampening). When you have the sub out, it wouldn't hurt to inspect the area where the wire enter the upper enclosure just to make sure there is a good seal. When I changed out my sub I did have to make a new gasket as others have, I used plain ol' butyl (I have access to lots) which is similar to mortite.
While I was in the modding mood, I removed the upper drivers and dampened the baskets of those as well.
These mods really tuned up the bass, now it is tighter and deeper than without these mods. The next biggest improvement I noticed other than the woofer swap was proper spiking and leveling (I put it off for a while, but man what a difference).
TouchOfEvil
04-14-2011, 02:38 AM
Glad more people are doing this mod with great success!!
EndersShadow
05-03-2011, 10:27 PM
I just did the upgrade in my LSi 15's. Thought I would post some pics of the stock woofer v. the DB840.
In the first two pics the stock woofer is on the left.
I still need to create a gasket on the speakers but will do that on Saturday.
dorokusai
05-03-2011, 10:36 PM
Another convert....ahhhh, I love it when it's more than a capacitor job. I'll never do another LSI15/25 again as I almost lost my sanity.
Another convert....ahhhh, I love it when it's more than a capacitor job. I'll never do another LSI15/25 again as I almost lost my sanity.It is a headache to do one top to bottom.
dorokusai
05-03-2011, 10:43 PM
I believe we're a club of 2 Mike.
EndersShadow
05-03-2011, 10:44 PM
Another convert....ahhhh, I love it when it's more than a capacitor job. I'll never do another LSI15/25 again as I almost lost my sanity.
LOL...that along with cost are what are making me think thats a long term upgrade :smile:
Ordered mine today, will let you know how it goes.
The lows have definately been an issue with my system, quite happy with the mids and highs but when I play a track with a mix of low freq sounds it gets really messy.
Regards
John
mole'
09-14-2011, 02:29 AM
good reading/info in here for a soon to be LSi15 owner....
61641
Ordered mine today, will let you know how it goes.
The lows have definately been an issue with my system, quite happy with the mids and highs but when I play a track with a mix of low freq sounds it gets really messy.
Regards
John
Finally got the new drivers in, very happy with the result considering the low cost and easy changeover.
The bass is faster, tighter and clearer, I guess in time it should improve.
The bass in RIDE ACROSS THE RIVER from DIRE STRAITS sounded so bad I often skipped the song now I can listen to it.
I'm quite happy with the changeover, thanks for the great tips and help on this forum.
Regards
The hardest part was probably removing the old grill, right?
The hardest part was probably removing the old grill, right?
Actually they pulled out quite easy?
The image actually shows the rubber/plastic gasket still on the DB840, I did actually remove these once I had noticed them and remembered that they had to be removed.
Brasiliaflyer
01-02-2012, 12:50 PM
Are you guys using the single or dual voice coil version of the DB840?
EndersShadow
01-02-2012, 12:57 PM
Are you guys using the single or dual voice coil version of the DB840?
Single Voice Coil
makdownunder
01-06-2012, 10:28 AM
whats the difference between the single and double voice coil?
EndersShadow
01-06-2012, 11:28 AM
whats the difference between the single and double voice coil?
The fact you can wire it to be a lower ohm load or a higher one by itself. You want the Single Voice Coil since the stock woofer is a Single Voice Coil.
dorokusai
01-13-2012, 08:16 PM
The hardest part was probably removing the old grill, right?
Sometimes they come out easy as pie, others are super jammed up in there.
Just use caution when removing the old grills, be patient. The new drivers sound better and look even cooler don't you think? Thanks for the pics JMOS.
Oh, and your welcome TOE, sorry that I neglected to catch you thank you about this so long ago. I worked with engineering on this modification years ago when we wondered if there was any easy stuff to do aside from xover modifications on the LSi series.
BeefJerky
02-28-2012, 12:30 PM
Okay, I guess it's time to resurrect this thread again! I recently acquired some LSi15's thanks to our awesome member DMara. I decided to give this mod a try since the price was right, and from other's comments, I had nothing to lose. I got a set of db840's and some Mortite off of Amazon for right around $106 shipped. I also purchased a large box of Dynamat Xtreme since I want to do some noise reduction in my car, so I also put Dynamat on the outside of the port tube as Mark suggested. It only took about an hour to do the mod, and it was very straightforward.
The results are very good. I just got them hooked up, and I can immediately tell how much tighter, cleaner and accurate the bass is. It also does seem to dig a bit deeper. I imagine it will only improve as the new drivers break in over the next few days. There also seems to be less port noise when playing loud, heavy bass notes; I assume this is due to the Dynamat.
At any rate, I highly recommend this mod! It's easy and quite inexpensive.
jhracer3
03-12-2012, 04:32 PM
BeefJerky,
Can you post a link to the mortite you bought? I saw they have a few options on Amazon, I was wondering which weight/thickness to go with.
Thanks
EndersShadow
03-12-2012, 04:41 PM
BeefJerky,
Can you post a link to the mortite you bought? I saw they have a few options on Amazon, I was wondering which weight/thickness to go with.
Thanks
Another better (IMHO) option is Armaflex which you can buy at Lowes, Home Depot, ect. It comes off much easier and is easier to work with as well.
Here is a review (http://www.polkaudio.com/forums/showthread.php?123136-SDA-Driver-Seals-Original-Foam-vs.-Mortite-vs.-Armaflex-Foam&highlight=mortite) of the differences between mortite, armaflex, ect.
Here is what it looks like: http://www.homedepot.com/h_d1/N-5yc1v/R-100539553/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=Armaflex&storeId=10051
Denon Frank
03-13-2012, 12:21 AM
When I did my DB840 upgrade I used a sharp blade and cut the gasket that came with the new speakers. Just take the gasket off the new woofers and slowly & carefully cut the gasket along the back edge where it has a seam (where it starts to curve from the flat edge with the mounting holes.) You'll end up with the thin part of the gasket that has the holes in it as you new mounting gasket. Just take your time and it works great. :smile:
cbow8
04-21-2012, 03:38 AM
nice mod guys. this is very tempting. been almost a month^^^has anyone tried different subs????
stretchl
09-01-2012, 08:24 PM
Damn, I just read this thread
http://www.polkaudio.com/forums/showthread.php?123136-SDA-Driver-Seals-Original-Foam-vs.-Mortite-vs.-Armaflex-Foam&highlight=mortite
What has become of this DarqueKnight?
That's quite a set of data he posted!
dorokusai
09-02-2012, 10:18 PM
The only Polk subwoofer that fits, is the db series. We tried to get an SR series subwoofer to fit but the magnet structure is too big and the Power Port becomes a problem. I'm sure you could find similar sized subs to the db and they would work but that was the subwoofer we actually played with in a chamber, tested and worked on in-house, to see if it would work as a better driver choice.
Mark
mesquitehead
09-11-2012, 07:37 PM
I ended up using the gaskets on the replacements and left out the moretite and they fit fine. I did use all the screw holes though. I used Dynamat extreme on the woofer frames and also wrapped the ports. I notice a much fuller and substantial low end and I think it helps the overall sound of the 15's sound blend better from the high to low end.74989
jon s
09-21-2012, 01:06 AM
Question... When I disassembled the OEM woofer from the cabinet, the white lead was + and the yellow lead was -. But the leads have different sized connectors... If I fit the connector by size, the polarity is reversed. Did anyone else notice this? If so, how did you resolve it? Did you solder the connectors on correctly?
Connecting the wires by size gave me a very slight increase in bass so I am assuming that the polarity is incorrect.
jon s
09-22-2012, 03:30 PM
Aargh... my mistake, the wiring is correct... But I do not notice any increase in overall bass response, it actually sounds less... The bottom extension appears deeper, but the midbass response seems reduced. Some music that had thumping bass now sounds subdued but goes lower. Depth seems to have improved.
The mortite I bought from Home Depot was kind of dried out... it had a crumbly texture... is that normal?
Drenis
09-22-2012, 06:03 PM
I dont think it`s supposed to be dried out. Also remember drivers need some time for break in.
But everyone says its better so you be the judge.
EndersShadow
09-22-2012, 06:11 PM
It's less boomy which is what your describing. Your getting accurate bass for once. Turn it up and it's got more than enough bass.
Trust me I know.
What are you powering it with power wise and source wise?
halo71
09-22-2012, 06:35 PM
Anyone that has upgraded to the db woofers and still have the stock woofers laying around and wanna get rid of them please PM me. I would like to get 6 more of them for a "project".
Phred_t
09-26-2012, 05:41 PM
I'll have 4 of the stock 8" drivers available at the end of this week after I upgrade all mine.
halo71
09-26-2012, 08:05 PM
I pm'd you Phred.
PSOVLSK
09-27-2012, 09:38 AM
pm'd you Gary.
A bit off topic --- has anyone thought of or tried DB1040 on Lsi25? I'd be very interested to hear the results.
dorokusai
10-26-2012, 08:19 PM
We had problems with the simple idea of just using the larger version, on the larger version. It's more than a few issues including proper clearance of the power port and cabinet volume were just two problems. The volume isn't a huge issue but it became a project that had more work involved and it wasn't just a drop in replacement like the smaller model. It was abandoned and I'm not aware of anyone doing this mod, nor would I suggest it unless you had the money and time. Just my opinion.
Mark
Polk Audio CS
I appreciate your reply. No, I am not brave to try.
dorokusai
10-28-2012, 02:08 AM
Plus, honestly, I don't even like the LSi25 so I would put forth no more effort than I already have. The fact you can drop-in and plug in the LSi15/dB Series woofer is just the sweetest deal ever. The mod has been done here over a dozen times, it works and I've yet to hear any complaints.
It all stemmed from an email I sent to Engineering many years ago about, "What would you do to mod the LSi series?". And the first model out of the response was the LSi15. The exact driver was immediately mentioned and a couple smaller issues that were also passed on and can be found in the threads about this modification.
Clearly, they had messed around with this idea and if you have ever met the folks from that area of Polk HQ, they like to try things and test theories. If they didn't we wouldn't be here and we wouldn't even care about this in the first place. These folks love their job and they love to push the envelope, even if its simple things.
That's why Polk Audio has such a following here and why they(HQ) think its weird when we want autographs on vintage drivers, literature and sometimes even body parts when we get the chance to do tours in Baltimore(2005/ 2008/ 2012....am I getting the years' right guys?). Other manufacturers started doing stuff like this YEARS after we started to do it and make it painfully public. Suck it Carverfest.
Mark
Drenis
10-28-2012, 09:03 AM
Other manufacturers started doing stuff like this YEARS after we started to do it and make it painfully public. Suck it Carverfest.
Hahaha! Thanks for the great morning laugh Mark.
PubFiction
12-23-2012, 12:22 PM
Are there any other options besides the polk replacement for this driver that anyone has found? I am not a fan of their look.
EndersShadow
12-23-2012, 02:12 PM
Are there any other options besides the polk replacement for this driver that anyone has found? I am not a fan of their look.
You can't see it once you put the cover back on. Plus the subs face sideways so you shouldn't see them regardless lol
PubFiction
12-23-2012, 02:16 PM
well mine are positioned so you can see them and I liked to keep the grill off.
F1nut
12-23-2012, 02:31 PM
If you are watching the drivers when listening, you are NOT listening.
Drenis
12-23-2012, 05:06 PM
well mine are positioned so you can see them and I liked to keep the grill off.
You either have way to extreme of a toe in or like F1nut says, you're doing it wrong. Why do you dislike using the grill?
well mine are positioned so you can see them and I liked to keep the grill off.I guess you're SOL then.
PubFiction
12-26-2012, 02:29 AM
Lots of people like to have the grilles off I don't get the big deal? They dont really add much to the look other than provide a cheap cover up for bad looking or gaudy speakers. But its fine, obviously their is not a known alternative.
F1nut
12-26-2012, 02:40 AM
Grills serve a few purposes that you seem unaware of. First and foremost, they are an integral part of the speaker's acoustical design. They keep dust and grim off the drivers. They keep little fingers from poking. So, put your grills back on.
If you're serious about finding another sub that has the same parameters, this is what you want to look for: http://www.polkaudio.com/products/db840
Be advised, you will probably end up with another car sub which will either look similar or much more gaudy.
Resonant Frequency 49 Hz
Xmax
Xmax Linear .51 inch/13 mm (peak to peak)
MMS 67g
BL 10.3 Tesla Meters
CMS 157.6 Micro Meters
Recommended Enclosure Sealed/Ported/Bandpass
SD 35.65 sq inch/ 230 sq cm
VAS .42 cubic feet/11.9 L
QTS .6
QES .6
QMS 14.1
Diameter 8" (20.32cm)
Cut-Out Diameter 7 1/8" (18.10cm)
Nominal Impedance 4 ohms
Efficiency 85 dB
cbow8
12-29-2012, 06:57 PM
i hooked up my lsi15s today. they have crossover mods and the db840. sound good to me. its about the perfect blend for a nice rich sound without being boomy and annoying. i dont think id want anymore bass from that model of speaker. db840 is plenty of sub for this application.im running somewhere around 850 watts to them and havent heard any distortion or sign of being a weak link. those are my thoughts about this mod. thanks guys have a happy new year!!
zeppelin2
05-01-2013, 05:20 PM
Can we get some long-term impressions from those that made the db840 swap?
Has anybody reverted back to the stock woofers?
EndersShadow
05-01-2013, 09:09 PM
Lol the lack of posts after doing the mod are due to the members enjoying music too much to post lol.
They sound MUCH better. I sold off my stock woofers and haven't looked back.
jon s
05-02-2013, 11:02 AM
changing the woofes made the bass a lot tighter... The original drivers tended to be a bit boomy.
Jer.War
05-03-2013, 01:51 PM
Definitely worth doing. The bass is a lot tighter! The mod is cheap and easy to do so it is a no brainer. Sounds EVEN better after upgrading the crossovers :)
hochpt21
05-22-2013, 10:43 PM
FINALLY pulled the trigger. Have owned the 15's for over a year now, so figured it was time. Under 90 bones. Will be here Friday.
jon s
05-23-2013, 12:57 AM
You won't regret the upgrade... the only thing you'll regret is why you waited so long....
ZLTFUL
05-23-2013, 12:16 PM
Where did you find then for under $90? I keep finding em for between $110-$120...
ZLTFUL
05-24-2013, 09:52 AM
Nevermind...found em on Amazon with free shipping.
hochpt21
05-24-2013, 10:01 AM
Nevermind...found em on Amazon with free shipping.
Sorry...yes, Amazon.
When I was looking a few months back they were in the $50-$60 range (each), but the price has dropped. Crutchfield now says discontinued product so that might have something to do with it.
EndersShadow
05-24-2013, 11:31 AM
Sorry...yes, Amazon.
When I was looking a few months back they were in the $50-$60 range (each), but the price has dropped. Crutchfield now says discontinued product so that might have something to do with it.
Yeah they are discontinued, I may snag another set to have in case I get another st of 15's at a later date.
Also the ones on Amazon are probably NOT from a authorized vendor so they are cheaper. Not sure thats a biggie as they dont get nearly as much wear/tear in the LSi's as they would in a car.
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