The very few DVD-A's that have 2-channel (or mono, didn't know about that) 192kHz also usually have lower resolution on the disc, like 24/96 5.1. Otherwise you would need to rip, convert to 24/96 and either reauthor or play that from a USB disc connected to the Oppo...

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.