JL audio 500/1 powers on but no audio

AX tech editor
Joined 2002
Paid Member
What did you try to diagnose? Changed speakers, changed preamps/sources?
One channel dead, both dead?
Type/brand of amp?
Powers on - what does that mean? Did you check the power supply voltage, fuse, pilot light?
There's a lot you can do by logical thinking and help us to zoom in.
You know, the spirit of DIY?