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  1. #181

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    I just did this swap as well, and apples to oranges (without tuning anything else) the db840 sounded faster and tighter/cleaner than the stock, but overall the speakers standalone sounded like they had less frequency response to my ears in full stereo mode. When used with my supercube sub, the system sounded better for HT in 5.1, but stereo electronic music sounded like it was missing some low end (although tighter hits) on first listen with no tweaks. I have to try to re-eq and room correct after burn in to see if it was really worth the effort and $100 bucks.

  2. #182

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    Default Switching back for now

    So, after a couple of days playing with this, I have found that the new woofer has caused my speakers to noticeably distort when listening in "direct" mode. I am not sure what is causing this, but the switch seems to have caused it. Perhaps the switch caused the already power hungry Lsi15's to be even more power hungry and my amp is not up to snuff. Perhaps it is my Pre-Pro, which I am also looking to upgrade. (I have an Emotiva UMC-1 with a UPA-5. . . love the UPA-5, UMC-1 has always been suspect IMO). The system sounded great always before the switch in direct mode, so I am leaning to switch them back out and maybe try again after I get enough money to upgrade my pre-pro and get some Monoblocks or Reference 2 channel to run the LSi's in front stereo mode and 7.1 mode.

    Any thoughts or experience on this from others? Could the switch cause more harmonic distortion or overdraw an amp, or is it just my setup?
    Last edited by dcluley; 12-28-2013 at 12:28 PM.

  3. #183

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    Not sure about this swap. I have had mine on for some time and I think something with the speakers or this swap is
    causing my Emotiva XPA-2 amp to fault... I will be sending the amp back for the third time next week..
    AS a note. I tried to put the stock woofers back on last night and I could not get them off. I used Mortite as a gasget. I pulled the bass plate/stand off and the treminal post off and tried knocking them out with a wood stick.. They will not come out.
    I am at a point of selling or trashing these speakers. It's to bad, the mid range and highs are lovely on these. Bass sucks.
    Really disappointed right now.

  4. #184

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    Quote Originally Posted by ematthews View Post
    AS a note. I tried to put the stock woofers back on last night and I could not get them off. I used Mortite as a gasget. I pulled the bass plate/stand off and the treminal post off and tried knocking them out with a wood stick.. They will not come out.
    I had the same problem. I was finally able to pry the driver out of the cabinet using medical forceps. I stuck them into one of the screw holes and was able to pry the thing loose. Care must be taken as the tool can slip and easily scratch the wood veneer!

    http://www.medical-supplies-equipmen...ceps-525-1.jpg

  5. #185

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    Ha. I tried a dental pick and broke it... These things are super stuck..

  6. #186

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    I have the DB840 in my LSi15's and drive them all day long with either my Parasound HCA-800II or even my Denon DRA-835R receiver. Perhaps it is the amp.

    I agree that the mids through highs are fantastic but the bass can be a bit boomy. I much prefer the bass response of my RTA-11TL's, everything else it is the LSi's. I never heard them with the stock sub. In my case, I believe that the bass is mainly due to placement but I have limitations where I can position them. I am wondering if some sort of sound absorption would work.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  7. #187

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    I have a pair of modded LSi15s as well... I don't have any issues with amps with the speakers... I have used a Pioneer SC-67, Onkyo TX-NR906, Marantz PM-7200, Acurus DIA100 and a Sony TA-8650 with no issues... Something must be wrong with your amp...

    The DB840s do sound tighter than the stock, which tended to be a bit boomy. Never regretted the swap...

    Question: Are you sure you have the DB840SVC? If you have the DB840DVC and have it wired incorrectly, you could be set up for a 2-ohm load which would trip up most amps. Unfortunately, the alternative is to wire them in series (8-ohms) but the SVC model is the one you really have to use...

  8. #188

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    Quote Originally Posted by jon s View Post
    I have a pair of modded LSi15s as well... I don't have any issues with amps with the speakers... I have used a Pioneer SC-67, Onkyo TX-NR906, Marantz PM-7200, Acurus DIA100 and a Sony TA-8650 with no issues... Something must be wrong with your amp...

    The DB840s do sound tighter than the stock, which tended to be a bit boomy. Never regretted the swap...

    Question: Are you sure you have the DB840SVC? If you have the DB840DVC and have it wired incorrectly, you could be set up for a 2-ohm load which would trip up most amps. Unfortunately, the alternative is to wire them in series (8-ohms) but the SVC model is the one you really have to use...
    Thanks
    I checked and the are the SVC ones so no issue here.. I will keep an eye on my amp and send it back to Emotiva if there is more
    problems. Good thing it has a 5 year warranty.

  9. #189

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    One negative doesn't change the actual recommendation from Polk Audio. Not everyone will experience the same thing but 50+ have....whatever.

    When I worked for Polk we did this change in the chamber vs stock and it was an improvement.

    -d
    Last edited by dorokusai; 12-30-2013 at 08:41 PM.

  10. #190

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    Not sure what I did but just an update. I turned off my sub and disconnected it from the entire system..Moved my connections to Full output. And moved my speakers in about
    two inches... I am getting some good sound now...
    I also switched the speakers out and tried a few others I had... And to be honest, I didn't know how good these actually were... The other two speakers didn't have as much bass and the highs were very bright... These Polk's are good!
    Trial speakers
    Klipsch RF82
    Infinity P363

  11. #191

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    Caution on sub woofer selection!

    I did not realize that Polk made an 8" DXi series until I saw their boxed DXi108 sub (it is a dvc). They also have raw DXi 8" sub (DXi804 svc and dvc) that does not show up on the web page but does appear in the DXi series Owners Manual. Here is where the confusion sets in. Comparing the specs of the DB840 svc to the DXi804 svc, as listed in each ones Owners Manuals, they look identical. However, the specs on the web site "Spec" tab for the DB840 svc are different from what is listed in its OM. Usually, I would be suspicious of the web site specs and believe the OM. However, in this case I suspect that the web is correct and the OM is wrong. I have an email into Polk CS to sort out which is correct.

    When I do a speaker cabinet simulation using the LSi15 sub cabinet dimensions and OM specs for the DB840, things don't look right. They look better when I use the web site specs.

    Bottom line, the DXi804 is likely NOT a good replacement for the LSi15 sub. Stick to the DB840.

    Stan
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  12. #192

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    To make things even more complicated, I have a sales literature sheet for the DB series which has yet different specs for some of the parameters while others match the OM and others match the web. Take heart, some are actually consistent across all three sources.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  13. #193

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    My LSi-15's are for sale if anyone is interested. They look new, and don't have a lot of hours on them. PM me if interested.

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