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Hi, Folks: There is so much contradictory information on this and other sites that I need to come back to this topic. Is it really possible to stream hirez music data via Airport Express? People report doing it, but have they ever checked what's really coming out of Airport's S/PDIF?The setting: I have a lot of hirez AIFFs (24/88.2 and 24/96) recorded from my vinyl and I want to stream them unaltered to the DA-converter of my music system that accepts TOSLINK optical inputs from Airport base station's TOSLINK output. The files reside on my Intel iMac where I play the files either by Amadeus Pro or by Bias Peak Pro. Airfoil is set to "Pure Playback" for streaming the music to the Airport base station's S/PDIF-TOSLINK and the music plays nicely on my system.
However, when I checked the digital format of the stream arriving at Airport base station's digital output, I discovered that the stream is in 16/22.05. This is not identical to the format of the original AIFF.
My question is: at which point on the way from the original files to Airport's output are the files being converted from 24/96 to 16/22.05?
(a) Is it the program (Amadeus Pro or by Bias Peak Pro) playing the files that does the conversion to 16/22.05?
(b) Is it Airfoil (although it is set to "Pure Playback")?
(c) Or is it at the Airport client's (i.e. my iMac's) conversion to the IEEE 802.11g protocol that sends only 16/22.05 formats? IEEE 802.11g has enough bandwidth to stream 5.1 DTS signals. So it should be able to handle stereo 24/96 signals.
(d) or could it be somewhere else I didn't think of (e.g. in the Audio/MIDI setup)?If one of these is the reason for the conversion, how can this be remedied to really stream 24/96 coding?
If there is no such remedy, then why would I need Airfoil instead of iTunes that does the same?
Follow Ups:
are you using all those other apps instead of itunes? my APX streams at 44 (so sez the reciever). i don't think it's capable of any better than that. but that's better than 22k. I'd bet one of those other apps is doing something screwy. again, why not just use itunes?
admin - audioreview.com
no airport express only stream in Apple lossless 16/44Khz ..
but with a mods of the ouptut with a good bnc 75homs , it is a very highend drive..
look here in USA http://www.empiricalaudio.com/
or here in Europe http://www.db-system.ms/frame-airport.html
Gang,AE uses the TI/BB PCM2706 16 dac/spdif out at 32/44.1/48K that's it
Thanks
Gordon
J. Gordon Rankin
Thanks, Juanitox. These mods look fine but do do anything else than changing the clock quality? Even if one uses an Empirical Audio device, the streaming format still depends on my iMac's encoding of the IEEE 802.11g protocol at the beginning of the wireless connection. Or am I wrong?
itunes to airport express protocol resample anything (mp3, wav,aac) to apple lossless
than the airport stream 16/44khz wav .. so if you are listening cd WAV with itunes you will have a bit perfect wav at the output of the airport express.. that 's all...
but believe me or not but a good clocking system with 16/44khz sounds better than a
jittered 24/96 streaming...cheers..
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