“Will my CD player's digital audio format (PCM from its optical out port) be compatible with this sound bar? The LG website said LPCM is compatible but it didn't say anything about PCM. Is it that PCM will work if LPCM does?”
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PCM is usually associated with lossless uncompressed 2 channel audio while LPCM is more commonly used when referng to multichannel lossless uncompressed audio streams. PCM can carry surround sound but it cannot do so over an optical cable. The optical cable can only carry stereo PCM. To send surround PCM, you'll need to use the HDMI port on the LG SN6Y 3.1 Channel High Res Audio Sound Bar with DTS Virtual:X...^IFV
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