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” When a disc with a DTS-HD Master Audio soundtrack is played back, depending on the capabilities of your hardware the DTS decoder will either process the core 5.1 version (downmixing to 2-channel PCM if necessary), or process both the core version plus the extension data to effectively reconstruct the full lossless 5.1- or 7.1-channel soundtrack. In cases where a 7.1 DTS-HD Master Audio soundtrack is played on a 5.1 system, the back rear and side channel information is folded to a single set of stereo surround channels, but the resulting audio is still output in lossless, high-resolution format.”