Bought this amp off of a vendor on CACO and received it in about 5 days, only to hook it up and not produce any sound? Got everything hooked up with KnuKonceptz wiring and the amp turns on fine, just no sound output.. Could it be defective? Or could it be the RCA output on my HU(pioneer 8300ub)? Also changed my RCAs to new ones and running it directly over my seat to the amp. Will post pics soon. Any input is appreciated, thanks.