i own the w4snd dac 2 and use every single imput from sources including imac (itunes library/ usb), sonos/ coax, proceed cdp/ coax , request server/toslink and apple tv/ toslink. the dac runs thru my pass cary pre. the rti master remote handles every chore including source and volume control. all in all it's a pretty simple and nice system, although not good for tightening the stomach muscles! a word on the w4sdac 2: the depth of bass really surprised me. as in wow! sometimes i wonder if it is too much for my ears, but that would be my ears' fault not the dac. it made a remarkable improvement from every source but the biggest difference came about when i installed new power chords purchased from patrick cullen, son of rick cullen, who from what i understand sold his company to wyred for sound. by all means invest the money in those chords for all your power amps and other sources, starting with the dac.