OK, in case anyone cares, relative phase is quite easily audible in some
test signals, but not in others (I've just been playing with Audacity). 
If you combine two tones with commensurate frequencies - for example 200
and 400 Hz pure tones - it's very easy to hear the difference as you
change the phase of the 400 Hz tone.  The pitch sounds slightly
different.

On the other hand if the frequencies are incommensurate (as an example
I tried 200 and 341) you can't hear the phase.  It's clear why - these
tones sound constant, so there's no way phase could matter for
incommensurate frequencies that are far apart.

But since all instruments produce harmonics, I wonder whether this
might be audible for more realistic sounds.  If so, maybe there is
something to this idea of using fancy digital crossovers...


-- 
opaqueice
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