Cleaned as much as possible and still no sound. i went further into testing the rear channels and non seem to work. all of the rear channels seem to have power coming to them but no clear music. just hmming and fuzz. hopes this helps.

Hello and glad to be a new member to the PG Community. I have recently purchased a 500.4Ti series from a long time friend. he's been the one and only owner of this amp, kept his word and when finally selling it, i was the first to know. its been sitting in his garage for quite some time and said it ...