If this is a powered sub, than it will have it's own power supply and small mono amp, both of which can fail. Could be a fuse, but if the fuse blows again you will have a short on the main amp board.
SOURCE: JBL TLX PS10 Subwoofer - Does not work
If you have checked the fuses which it sounds like you have, your amp may be out. Take that RCA and plug it into the other speaker. If thar she blows, treat as warranty and call the factory. If this is helpful, please post as such.
SOURCE: pb12 makes thumping sound after warming up
Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...
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SOURCE: JBL PB10 subwoofer sounds distorted and lights on the front flash
More likely to be the Class D power amp module, but you should look through the service manual to make sure all the parts are installed correctly. My PB10 AMP module went out and you cannot get one anymore.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
then you will not get the subwoofer sounds or the dolby digital sounds206 views
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