What audio format output by A.E. my stereo only accept PCM sinal

Hi can anybody tell me what kind of audio signal is out from airport express or apple TV2? I read some information is ACC or apple lossless something. My stereo system only can decode PCM code. So the audio signal out from apple is on good for my stereo system??

Question: Let's assume I have a USB disk connected to a late-model Airport Extreme Base Station (I do). On the disk is an iTunes Library. In addition, assume that I use a Mac notebook to access that iTunes Library wirelessly and to stream the music in that library to an Airport Express that's connected via optical cable to a DAC.
If the music in the library is not in ALAC format, it will be converted to ALAC and streamed to the Airport Express unit where it will be recoverted back to the original format (let's assume AIFF).
When this happens, what hardware is used to convert the music to ALAC before it's streamed? Is is the Mac notebook computer or the Airport Extreme Base Station that is connected to the USB disk containing the music?
Thanks.

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notlost wrote:
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What audio format output by A.E. my stereo only accept PCM sinal

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