everything that is hooked up in the current setup:
mac mini connected to av7005 via HDMI
plugged into the macmini via USB.
(problem 1(but very minimal): when the drive seeks you can hear it on the speakers, I believe this to be because of the ****** on board sound card in the mini)
yorkville nx55p (connected via XLR)
yorkville ls2100p(connected via XLR, plugged into a surge protector on the other side of the room)
2x12" MTX terminators with a sony car amp which im powering with a computer PSU(connected via RCA)
xbox 360 (hdmi)
wii (directly into the TV, component)
Belkin PF30 - receiver, nx55ps, mini, tv, mixer(not in use) - everything else is plugged into a surge protector which goes into the wall.
LG 60" plasma (dont have the model # on hand)
up until this point everything is fine except when the USB storage seeks files i can hear it.
I then tried to connect my KRK rokit 8's into the surround L & R XLR outputs on the marantz and as soon as i do this the yorkville speakers buzz/hum?(power plugged in on opposite side of the room) It doesn't happen until the power is connected to the rokit 8's.
I have tried differen't XLR cables without any change, and tried different outlets with the studio monitors. also tried plugging one directly into the belkin pf30 with no change. Tried XLR to RCA and RCA to RCA cable and it lowers the noise but doesn't remove it.
The nx55p have a cut off button which changes it from 60hz to 100hz, when i turn it on a bunch of the noise is reduced.
I've tried the usb storage which causes the other noise but there is no change.
I've also tried disconnecting the subwoofers and no change.
The house is very old, can't think of anything else to add I'm sure there are a few other things I've tried but don't remember now
edit: removing the nx55p's when the rokit 8's are connected removes "some" of the noise but the rokits on their own still create hum
disconnecting the cable box hdmi from the av7005 removes some hum.