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Downmix Matrix (5.1 -> 2.0)

Left = FL + ( * FC) + ( * SL) + ( * LFE)
Right = FR + ( * FC) + ( * SR) + ( * LFE)

Assumptions: Standard ATSC A/52 downmix recommendations use 0.707 (-3dB) for center and surround channels. LFE is typically discarded (0.0) to prevent bass clipping on stereo speakers.