JBL PB12 dead?

[turkish621]

Ok, So I have a jbl PB12 that when I turn it on all is does is hummmmm quite loud. It is not connected to anything but power. I am pretty new to the audio/electronics world (I know computers) so I am not sure where to look. What should I be looking for? Can anyone please help me. Thank you.

 

[simon5]

I saw on the web that the problem is caused by a blowed up capacitor. It seems it's not a very reliable unit.

The best thing to do would be to swap the amplifier with a Rythmic Audio amplifier I guess.

 

[turkish621]

any other suggestions?

 

[simon5]

Replacing the faulty capacitor.

 

[theNoid]

Ok, So I have a jbl PB12 that when I turn it on all is does is hummmmm quite loud. It is not connected to anything but power. I am pretty new to the audio/electronics world (I know computers) so I am not sure where to look. What should I be looking for? Can anyone please help me. Thank you.

Ok, we need some info here.

1. Is this subwoofer new to you?
1a. If not new to you, has it worked fine in the past?
2. How loud is the hum?
3. Have you tried running a signal to the amp to see what happens?

Noidster

 

[Frank Berry]

This is a known problem with the subwoofer. Do a search and you'll find a rather lengthy thread which covers the problem in great detail.

 

[turkish621]

Well I took the amp off of the back and all the capacitors look ok to me. Do you know which one it is, or how to tell which one is bad?

 

[DcibeL]

Do a search and you'll find a rather lengthy thread which covers the problem in great detail.

 

[turkish621]

Do you know which tread? I searched and am having problems.

 

[Kenshin]

Class D forum

This is a known problem with the subwoofer. Do a search and you'll find a rather lengthy thread which covers the problem in great detail.

 

[crippledchicken]

just for future reference, some of the MTX so called, class D amps in their home theater subs have had many problems also just another brand to be cautious of. crippledchicken