I just got my outlaw 755 amplifier. The system makes a small buzzing sound independent of whether or not the volume is turned up or down. The buzzing can only be heard when my outlaw 1050 (I am using it as the pre/pro for now) is turned on. The buzzing sound was not there when I had my carver amps hooked up to the 1050. Any ideas what this could be?

Also, I hooked this amp up with anticipation that it would sound a lot better than my Carver amp but the difference is only minimal.

What do you think my next step should be to get hair raising sound?

Here is my setup:

DVD - NAD T550 (Running coax to the 1050..should i be running fiber for better sound?)

Pre/Pro - Outlaw 1050
Amplifier - Outlaw 755
Mains - Martin Logan Quest
Surrounds - Martin Logan CLSIIz
Center - B&W CC6
Sub - Outlaw LFM1

Currently I am using less than stellar component cables to connect the 755 to the 1050. Would upgrading these help a great deal? What else should I upgrade to get great quality sound? I feel like I bought pretty decent components but I am not getting the sound that I expect. Any ideas?