I'm using an Airport Express, connected to a Benchmark Audio DAC-1 by the digital/Toslink output from the Express. In theory, at least, the Benchmark eliminates any jitter coming from the Express, though I don't have any way to verify that.
At any rate, the sound of Apple Lossless files is pretty extraordinary, indistinguishable to me from the same files off the CD, and even mp3 files (most of mine are at a 192 kbps sample rate) sound remarkably good. The Benchmark is a moderately expensive DAC but it's incredibly versatile and one of those audio buys I've been happier with the longer I've used it.
At any rate, the sound of Apple Lossless files is pretty extraordinary, indistinguishable to me from the same files off the CD, and even mp3 files (most of mine are at a 192 kbps sample rate) sound remarkably good. The Benchmark is a moderately expensive DAC but it's incredibly versatile and one of those audio buys I've been happier with the longer I've used it.