Interesting! When you refer to pop by the 2496, was that on system boot or upon stating playback?
I'l be interested in either a USB DAC or Sound Card directly to AMP if I had the confidence that controlling the HTPC/JRiver was stable and near flawless for control (volume, zones), library browsing, and playback control. This will be done with either an iPad or iPhone and I know JRiver is focused on Android for now so my fate lies in 3rd party developers.
The multi zone playback direct to AMP is pretty interesting when I have to look at my backyard which has two stereo zones outside and my garage which is 2.0 for now but may expand to 5.1
So with the X-Fi Titanium Fata1ty you mentioned, you are running one of those per stereo zone or dividing up the zones? Quick glance at Amazon it doesn't appear to analog outputs.
Digging around I read through a thread here (same topic) that one of the comments was: "itunes and airport express are the system to beat, but MC has better audio capabilities and also does video, so would be great to get some answers on their multi zone capabilities"
In terms of audio, was the poster referring to control? What's the AQ sacrifice?