wrote:

Had this JBL Pro powered sub with a Crown 600 WPC amp in it. They did everything they could to make it impossible to service of course but I did it. Model MP418SP.

Symptom was that it would power up and then when you put input to it it would start clicking, LOUD. And then it would not stop.

Ran it down to a bad connection to one of the main filter caps. the negative one IIRC. Yup, the negative one.


** Always expect parts to vibrate lose with powered speakers.

Yep - electros, WW resistors, anything on a PCB heatsink, coils, PCB transformers etc. Bout the only bits that stay put are SMD.


..... Phil