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1b1ed1a
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I presume your optical link is S/PDIF, which supports only two channels of PCM, so unless the audio is being compressed (e.g. as Dolby Digital) on the fly, the sender (in this case the TV) must downmix to stereo or simply drop the extra channels. I wouldn't be very surprised if the TV is simply dropping the high channels. I would have tested this using an amp with HDMI input.