One of my favorite topics in the whole wide world:) – From the ProSound Web folks. Stereo mixing involves balancing out all audio signals equally for both sides, as human ear clearly understand from which direction sound is emanating to come up with a mix of multiple dimensions for more clarity without increased sound. Therefore, it is important to avoid sending identical signals to both speakers to minimize tonal, timing similarities, and avoid comb filtering. Therefore, one needs to send different signals to each side for better mix, good tonal balance, good sound reproduction etc, along with reduced audio signal in perceptual center for wider stereo quality sound.
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Mixing Beyond Stereo: Delving Deeper Into Aspects Of Sound & Perception