I have an older punch 360a amp -- it quit producing sound, the power indicator is on, I checked speaker connections and still no sound -- nothing changed anywhere else in the system -- would this be a fuse or some other problem? It is mated to a JL audio 12" running in bridged mode.
I have this problem too, checked sub with a battery both voice coils are good. I discovered that when my rcas are connected at one end they don't make any output when I touch the opposite ends together. I don't know what it could mean...maybe nothing?
It can't be a fuse cause if it was then there would be no power you might have blown the speaker terminals. did you check to see if the sub was blown.
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