If you produce two tones of say 22khz and 23khz then its true you probably wont hear the pure tones. However, when two tones are close together they intefere and an extra tone or "beat" is produced, which can be heard.
http://en.wikipedia.org/wiki/Beat_(acoustics) -- chalkandtalk ------------------------------------------------------------------------ chalkandtalk's Profile: http://forums.slimdevices.com/member.php?userid=16980 View this thread: http://forums.slimdevices.com/showthread.php?t=60973 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
