Considering that two speakers cannot accurately reproduce a 3D acoustic event in the first place, would using a center channel summed to mono with LR playing normally provide for a superior/more realistic listening experience than just using LR? Please note that I am not referring to listening to three channel recordings, but rather up-mixing two channel recordings to three channels.
I am considering routing audio as such with a MiniDSP 2x4 product:
Output 1: Right Speaker (Right input channel)
Output 2: Left Speaker (Left input channel)
Output 3: Center Speaker (Right + Left input channels)
Output 4: Subwoofer(s) (Right + Left input channels)
From Floyd Toole's book, there are significant acoustic advantages to using a center channel. Are there any downsides to using LCR for stereo reproduction instead of LR?
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