Surround monitoring is different with Pro Audio interfaces. They have separate channels for audio output ie routing via analog and they don't come with a surround sound decoder for the SPDIF. Surround sound is monitored via separate wires and speakers for each channel in surround. This means the audio interface has to have atleast that many analog channels to use for 5.1 or 7.1. The UR22 only has stereo so that would not be enough. That would require the UR824 or something similar which would cost far more. Consumer speakers have decoding or routing through the audio device and sub often times versus separate channels for each. This is ok for just listening to surround but impossible to use really for mixing surround. You also have the cost difference in speakers since you have to buy a speaker for each channel in pro audio setup. If you need surround and don't have the budget for separate speakers then the onboard audio or a Asus Audio card are going to be the best options.
Eric
ADK
