The amp is a Sony TA - 1150 , the buzz comes from the speakers and is temporary for around 20/30 seconds. It is a constant sound for this duration only. After 20/30 seconds it suddenly stops and the amp performs without any flaw whatsoever.
ok, thanks, but I just want to understand the dual amp situation, meaning: the CD player only has a phone output - I would want to use the Sony amp so how do I deal with the midi system one?