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  1. #91

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    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.

  2. #92

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    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

  3. #93

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    Quote Originally Posted by dorokusai View Post
    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

  4. #94

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    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

    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  5. #95

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    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!

  6. #96

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    Has anyone done something like this to the 25's?

  7. #97

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    i second that question...i feel that the subs are the weakest link in the 25s
    Living Room
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  8. #98

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    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?

  9. #99

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    ignore this...
    Last edited by jon s; 04-07-2011 at 03:47 PM.

  10. #100

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    Quote Originally Posted by EndersShadow View Post
    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.

  11. #101

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    Quote Originally Posted by dorokusai View Post
    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

  12. #102

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    I put dynamat on the tube and on the basket of the new sub and it did make a difference, to my ears!!

  13. #103

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    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.

  14. #104

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    Quote Originally Posted by dorokusai View Post
    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 :tongue:. Related to the LSi series of course lol

  15. #105

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    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).
    -------------[The Ever-Evolving System -------------

    LSI15's (PNF Symphony cabels, modded X-Over and subs), LSIC, LSI7's, Rega Apollo CDP (PNF ICON ICs, modified PS cct.), Yamaha RXV-1700 w/ ipod dock, B&K REF200.2 (fronts) Samsung BDP-1600, XBOX360, Patriot Box Office Media Player, 42" Samsung LCD.

  16. #106

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    Glad more people are doing this mod with great success!!
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  17. #107

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    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.
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  18. #108

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    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.

  19. #109

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    Quote Originally Posted by dorokusai View Post
    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.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  20. #110

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    I believe we're a club of 2 Mike.

  21. #111

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    Quote Originally Posted by dorokusai View Post
    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

  22. #112

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    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

  23. #113

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    good reading/info in here for a soon to be LSi15 owner....
    mole'

  24. #114

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    Click image for larger version

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    Quote Originally Posted by jmos View Post
    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
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    Last edited by jmos; 10-15-2011 at 09:16 AM.

  25. #115

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    The hardest part was probably removing the old grill, right?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  26. #116

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    Quote Originally Posted by Face View Post
    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.

  27. #117

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    Are you guys using the single or dual voice coil version of the DB840?

  28. #118

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    Quote Originally Posted by Brasiliaflyer View Post
    Are you guys using the single or dual voice coil version of the DB840?
    Single Voice Coil

  29. #119

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    whats the difference between the single and double voice coil?

  30. #120

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    Quote Originally Posted by makdownunder View Post
    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.

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