Has nothing to do with the signal or source - it is a failure of the turn on circuit - I repair this amp - can help if you find my add here or I am located on ebay as well. Juust do a search for We Repair JBL and find the model :)
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it's sound like you've done your best and from my pov, you're not missing anything but just need to get the subwoofer repaired by the manufacturer or completely replaced.
First try to find the source of your problem. The easiest way would be to try your sub with a different audio source to see if the problem still occurs but is sounds more like there's a problem with the receiver.
Hi my name is MIchael and I repair the following amps JBL PB10, PB12, PS10, PS12, TSS-1100,TSS-1200,VENUE SUB12, E250P. If it has the screw near the on/off switch. If your amp is blowing the fuse, has bad sound, no sound, doesn't power up or if the output is low or muffled. We can fix it - please check ebay and search WE REPAIR JBL PB10, PB12, PS10, PS12, TSS-1100,TSS-1200,VENUE SUB12, E250P - you will find us ... Edwards Electronics ....
Edwards Electronics not only repairs the following amps they also do upgrades to them so they do not burn up again: TSS1100 TSS1200 PS10 PS12 E250P PS210 and a few others - Look on Google for them or Ebay. Thanks.
if your serial number starts with ha then it's probably a bad capacitor C72 . 6.8uf 100v np electrolytic. replace it with a higher voltage capacitor of the same value.
These subs have had many problems, all associated with the amplifier section. PB 12's with an "M" as part of the ser. no. were assembled in Mexico and these are the ones with the amp problems. JBL fixed mine and sent it back no charge, BUT it cost me nearly $100 to send it to them in the first place. I have another one that has had no problems at all. Try sending it back for repair. At best you'll get a rebuilt unit back, at worst a substantial discount from the company for a new sub.
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