I don't think there is a .wav file format for 2.1 audio. At least I can find no references to it with Google and wikipedia.
The bass channel is normally derived from 2 channel stereo at playback time by summing the 2 channels then low-passing that sum. Due to variations in various subwoofers in the crossover frequency (where the subwoofer quits and the other speakers take over) it is the simplest way to do it.
Last edited by Philbo King; 05-21-2019 at 06:16 AM.
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