Using lossless codec with air tunes / airport express

i recently installed an airport express so that i can listen to my itunes library on my stereo. i have connected the airport to my stereo using a toslink cable. most of my library is encoded at 192kbs or 128 kbs aac files. i was hoping that if i encoded music using the lossless codec that i would be able to match the sound i get from my cd player through the stereo. my early tests have not worked well. if i compare a song in my itues encoded at 128, 192, 256 and lossless they all sound basically the same when played through my stereo using airport express. none of them sound as good as the same song played through my stereo from the cd player. the cd player is hooked up via a digital coax and both the cd player and the airport express are programmed identically in the stereo (using the stereo uplink sample). my asumption was that since both sources are digital (assuming that itunes to express to toslink remains digital) and that from what i have read the lossless codec is indistinguishable from a cd in playback that the two would sound the same. however the cd sounds much louder and fuller.has anyone had a sucessfull experience where the airport express has matched a cd in playback quality? any thoughts / suggestion? thanks.
ian

hi james. my understanding is that i am feeding a digital signal from itunes to ax to my stereo and that because i am using a toslink optical connection from the ax to my stereo the signal remains digital until the stereo's internal dac converts it. this is essentially the same process that is happening with the cd player. the digital coax feeds a digital signal to the stereo where the stereo's internal dac converts the signal. so the question becomes why with a lossless codec would there be any difference in sound quality if the digital signal is being processed exactly the same way in the stereo? my only answer is that i am not receiving a pure digital feed from the itunes to ax to stereo path. somewhere it is being stepped on. any thoughts?
ian

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