Question about JBL PSW-D112 Speaker

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Recently acquired a PSW-D112 Sub in good shape and also still have a PSW-D110 sub that has not really ever been used. I have been reading all the posts about these models amplifiers crapping out because of incorrect circuit board Capacitor(s), power module? ratings and the fixes. So like everyone else, I can get access to their service manual and confident in replacing and resoldering what needs replacement but realize these parts are no longer available thru the manufacture. This does not boast alot of confidence so I just need to know if comparable parts are available thru parts-express or another warehouse? Don't know if I should go on wild goose chase look for parts, scrap them, or replace the amp w/ similar one? It's a shame, both in good shape. Even if I use the D-110 it is still going to do what all the others have and fail in time!

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Or you could prepare for the worst but live in the moment and wait til it dies. You have time on your side. Plus, you could always use it as a passive sub if you have a separate amplifier. I did that with a Klipsch KSW-12 when my second copy blew its amp.

Posted on Apr 10, 2011

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It is the Class D power amplifier module that JBL uses a lot in the powered sub-woofer, they are very unreliable and hard or impossible to get.
I had modified them to use linear power amp IC instead.
http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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Have a PSW-D112 sub woofer that needs a new amp. Repair facility says original amp took a catastrophic power surge and it's toasted. JBL says repair parts not available. Please advise on source for...


Go to Parts Express and buy the Bash 300w digital subwoofer amp.It fits almost exact except it is one inch shorter.Just use mdf to fill the space and this amp will outperform the original.I have done this and it's not really difficult,pretty straight forward.
They usually sell for around $149,but they have sales often around $99.Good luck.

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That model is known to have issues with the amps.Your problem is caused by a couple of components on the board shorting out.If you pull the amp out you will find on the large board behind the speaker terminal a couple of burned components.

The easiest fix is to buy a Bash 300w amp from Parts Express and replace the original amp.The Bash amp fits pretty well except that it is about an inch shorter.You can fill the hole with some mdf and have a sub that actually performs better than the original and with less heat build up as it is digital.Hope this helps,it's not complicated really.

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You really need to be looking at this from the PC side.

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Please verify that we're talking about a JBL PSW-D110 here. I'm making no assumptions.

Are you running the Ipod into its L & R RCA jacks as prescribed?

Have you tried it with something besides the Ipod? A sub isn't supposed to reproduce a full range signal. Come to think of it, is the Ipod even outputting anything within the sub's operational range? I don't expect a lot of real bass comes out of one.

Perhaps you could try adjusting the Low Pass up to 180 to see if anything anywhere near the 'real' bass region is present.

Bottom line: There's not a lot of need for a sub (and no other speakers) running off of any music sound source. You wouldn't hear anything above 180hz.

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I would suggest to check the rectifiers first, very unlikely that the capacitors became shorted.

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If it is fused check to see if the fuse is blown... Start with power and work you way down from there.
Power to the sub.
Signal to the sub
Cabling to sub
Check the speaker itself to see if it is good.

john




Aug 16, 2008 | JBL PSW-D112 Speaker

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