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@ondelette, @WT
My apologies, I did not think either of you would react so strongly. But I enjoyed your replies, so thank you both.
Ondelette, I am a bit puzzled by the beat frequencies. Are you saying that it is necessary to have the frequencies above, say 20 KHz, in the playback system because these tones can beat in the ear and thus non-linearly generate lower frequency tones that are audible? Do you have a reference?