joe@cornell.UUCP (Joseph Bates) (05/13/85)
I recently posted an argument to the effect that frequency dependent phase shifts should arise due to the manner in which many speakers are constructed (independent tweeter and woofer). If there is a correct position for one's head (highs and lows properly in phase) then slightly higher or lower positions should have highs arriving earlier or later than lows, resulting (by definition) in a frequency dependent phase shift. I wanted someone to explain why this was benign, while the freq dep phase shift due to steep anti-aliasing filters in some CD players is often claimed to cause harshness. Several people have commented on the effect, explaining why the phase shift due to head position is not likely to be audible. What I want to know is why the phase shift from the anti-aliasing filters is different from that arising due to head position. There must be some audiophile out there wwho can explain this, or does everyone agree that the filters have no audible effect (due to frequency dependent phase shifts, at least)? Please someone, give this a shot! joe (joe@cornell.arpa)