I also appreciate the comments on DACs. I'm building a two channel system starting with some Selah Audio MTM speakers. I expect to buy a RR2150 so I can take advantage of its bass management and add a sub. I have an oppo 980H that I can use for CDs but I wasn't all that impressed with its stereo capabilities (unlike my Oppo BD-83) hence the desire for a DAC. But the real advantage of the RR2150 is its USB input for use with my Mac. How big of an improvement was the DAC Magic over the RR2150's USB DAC?