I am a new Babyface owner.  My Babyface sounds fine through headphones, but when I connect either Outputs 1+2 or Outputs 3+4 to my Speaker system I can hear interference from the computer through both the tweeters and through the woofers.  The noise subsides when I connect a ground wire from the back of the Babyface (at the screw connector for the DIN cable) to the ground connection on my Monster HTS 2600.

I have read through the forums and tried the following to no avail:

1) Dedicated USB host controller.   Startech PEXUSB3S2 (this apparently helped another with the same problem) did not help

2) ART DTI. (this was recommended by an RME administrator.)  did not help

The only thing that seems to help is to ground the Babyface to the Monster.

At this point I'm not sure what to do.  Please help RME!  Noise exists when using Outputs 1+2 or 3+4)

Thank you.

Rosewill RG630-S12 Power Supply, AMD PhenomII X3, Asus M4A78T-E Motherboard, StarTech PEXUSB3S2 USB Host -> Audioquest Cinnamon USB 1.5m -> Babyface -> Muse Model One Hundred Power Amplifier (Pin 3 XLR left floating with OUTS 1+2, TRS -> RCA with OUTS 3+4) -> Audioquest Rocket 44 Biwire -> B&W CDM2 Loudspeakers