To me, the M^3 with Sigma11 PSU (with the OP627s) is colored. It's bass heavy and a bit bloated and slow. Finer details also tend to be covered up by how warm it sounds in contrasts to other more neutral sounding amps.
I have tried everything I can with Foobar2000 using wasapi in Windows 7 64bits but I still can't get the DI(bypass mode) to pass a 16 bit 44.1kHz DTS wave file to my receiver.
Here are the things I've tried: