Picked up a 256 ready for the multi 
but hooking it up to test and the sound is VERY loud when using the RCA outs on the front of the unit, and you can hear the DVD drive loading/whine over the speakers
its currently being powered by the Jamma adapter but the sound directly from the 256 to a small amp, I had a 256 in the past that was powered by the JVS lead and this sounded fine, is this faulty or is it the Jamma adapter bumping up the audio?

but hooking it up to test and the sound is VERY loud when using the RCA outs on the front of the unit, and you can hear the DVD drive loading/whine over the speakers
its currently being powered by the Jamma adapter but the sound directly from the 256 to a small amp, I had a 256 in the past that was powered by the JVS lead and this sounded fine, is this faulty or is it the Jamma adapter bumping up the audio?