Question about JBL PSW-D112 Speaker

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No more thump

My sub powers on, but sounds like no signal is getting to the power amp. it has a pulsing buzz when music is playing. replaced 2200uf 100v caps. temp has efect around Q12 transistor and R15 resistor is missing. looks like R15 was cut out. no cold solders. any suggestions where to check next. nothing looks burnt or swollen. thanks, tboybad

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5 Suggested Answers

Maanita
  • 1142 Answers

SOURCE: JLB PSW-D110 Subwoofer Issues

Humming is always caused by low earth resistance so check the earthing.

Posted on Sep 09, 2008

SOURCE: JBL Sub 12 continues to make clicking noise

check the audio amplifiers of the sub

Posted on Jul 13, 2009

Grubhead
  • 4872 Answers

SOURCE: JBL Sub 12 going in and out of standby.

It sounds like a semiconductor device becomes faulty when it gets hot. Check around the parts you have looked at already for a transistor or IC etc. If you find anything wait till the sound acts up and then spray the suspect part with Servisol Freezer Spray. If the sound becomes normal again it's faulty. You can get the spray from Maplin (UK) or Radio Shack USA or that type of shop.

Posted on Oct 11, 2009

  • 1 Answer

SOURCE: no sound from sub. fuse is good and the amp

having jbl speakers but no sounds at all

Posted on Dec 31, 2009

  • 382 Answers

SOURCE: I need a new power amp for a JBL PB12 Subwoofer

Alf, when there is no parts available you have to start looking at local non authorized repair shops that will inspect and repair the board instead of trying to source a replacement board.

This can be very difficult and could make for alot of expensive deposits. Running out of parts is an ongoing problem with all electronics and sometimes replacement is the most cost effective option.

Cheers,

Kevin

Posted on Feb 09, 2010

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I turn it on and at the volume set @ U or straight up(midway) nothing comes out. if you turn it all the way up of course you get alot of buzz and barely get any sound from a mic or mixer signal,etc. could...


Make sure you are using BALANCED line to this... XLR connections boyh ends. Make sure ALL interconnected devices are powered from the same receptacle or power conditioner. Test your cables... they do go bad. This unit REQUIRES line level input. Do NOT expect a mic to drive it directely. Make sure your mixer uses the XLR outputs and is powered from the same receptacle, even if you have to run an extension cord to it. This is a bi-amped speaker so there are independent amps for high and lows. With nothing out and known good in there is very little electronics before the signal is split to the separate amps. At line level, your volume control should probably be about 2 o'clock with the EQ's straight up flat.

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2 Answers

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It sounds like you are describing an earth loop problem. I won't go into detail in this post, but try an isolation test first. disconnect everything from the reciever except the sub and try connecting say a BATTERY powered mp3 player or cd player to minimise connections to the electrical mains earth. you could also isolate things by taking your sub to a friend's house and trying it on their system.
If it is an earth loop use a process of elimination to find out which two pieces of equipment causes the earth loop. then apply filtering.
you can buy earth loop isolation transformers for about AU$26 and I've used one on my sub myself. Theyhave RCA (phono)plugs on each end and they connect inline with the signal cable to the sub amp.

as for the thumping sound it might be the speaker protection circuitry cutting off the amp to protect the subwoofer speaker from damaged. This might be triggered if the earth loop sound is causing the sub amp to overload and clip.

Failing this there might be a dried out overheated electro capacitor in the amp circuit causing the hum. Hav a chat to your local electronics person, who should be able to spot it!
Hope this puts you on the right track
Happy Hunting!

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1 Answer

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yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
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1 Answer

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You don't give us much to go on...

Are your subs self-powered? Disconnect the Line In to see if that makes the pulsing stop. if it does there's some kind of signal coming from UPstream or a cable has poor shielding. If it keeps pulsing something's wrong in the sub's power amp(s).

Isolate that much and come back.

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1 Answer

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7 Answers

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You need to check your ground connection. If there is a bad ground there will be feedback to the amp and it will just sit there and loop back with the Thump, Thump, Thump sound. I had to wire my amp's ground all the way back to the negative battery terminal. It was a pain but I have never had a problem since :)

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