I am running Mac OS X & iTunes 7.5. I occasionally stream files (all 44.1 kHz sampling rate) or Red Book CDs from iTunes via AirTunes to AirPort Express w/ mini Toslink output to external DAC w/in A/V receiver. My DAC is not HDCD capable, nor do I have any DTS encoded CDs to check bit for bit transparency of the transmission.
In 2005, JA published that iTunes via AirTunes utilizes Apple Lossless (ALAC) for the 802.11b/g transmission between iTunes & AirPort Express, that the transmission is bit for bit transparent to the source file (assuming 44.1 kHz) or Red Book CD.
Is the above still true despite the discovery of the iTunes sampling rate "bug"?
Also, in light of recent information, I have changed my Audio MIDI Setup sampling rate configuration from 48 kHz to 44.1 kHz.