Quantcast MPEG1 Layer II Multi-Channel - digitalFAQ.com Forums [Archives]
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Multi-channel files may have up to 6 defined channels: Left(L), Right(R), Centre(C), Left Surround (LS), Right Surround (RS) and a Low Frequency Enhancement channel (LFE).

ISO13818 defines 5 multichannel modes (on top of the normal stereo mode), each of these modes may have an optional LFE channel:

3/2: L, R, C, LS, RS
3/1: L, R, C, mono surround
2/2: L, R, LS, RS
2/1: L, R, mono surround
3/0: L, R, C

The "standard" surround sound encoding of "5.1 channels" is achieved by using mode 3/2 plus an LFE channel.

A multi-channel mpeg file should decode OK on any mpeg decoder. If the decoder doesn't recognise the multi-channel extensions, then you'll just get a stereo file containing a downmix of the 5 channels.
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