I think it's the isolation transformer in the Digital Transport Edition of the modded Oppos that can't use balanced power. So just don't get a DTE.

HD621, G98DH, G68ADV, Bc Acoustiqe ACT A3, 5200C DSP33, NuForce Reference 9 monoblocks, 2x SB3's, Velodyne DD-15 & DD-12 Subwoofers and a Meridian sub.