I'm using all functions (EQ/XO/Time Alignment/Phase adjustment) on my alpine so I'm not sure which part of it is causing the noise.
I've done the following to determine that it's the alpine and not anything else in the system.
Plugged in a different CD player (actually a progressive scan DVD player that plugged into the wall) into the Alpine, had noise...so it's not the computer.
Plugged in a set of head phones (Sennheiser 550s) to the computer with and without my head phone preamp, no noise...again, it's not the computer.
Tried different RCAs, run direct from the Alpine to the amps, still have noise...so it's not the RCAs.
We've tried plugging the DVD player straight to the amps as a full range signal to the mid-ranges, no noise, so it's not the amps.
The noise is coming primarially through the mid-range speakers...naturally...