Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site rabbit.UUCP
Path: utzoo!linus!decvax!harpo!eagle!alice!rabbit!jj
From: jj@rabbit.UUCP
Newsgroups: net.audio
Subject: Superstition revisited---
Message-ID: <1750@rabbit.UUCP>
Date: Wed, 3-Aug-83 11:24:28 EDT
Article-I.D.: rabbit.1750
Posted: Wed Aug  3 11:24:28 1983
Date-Received: Wed, 3-Aug-83 21:16:55 EDT
Organization: Bell Labs, Murray Hill
Lines: 21



What the gentleman from rochester has done, by putting ONE
tweeter out of phase, is introduce a CHANNEL DEPENDANT
phase shift.  What the DAD does is introduce a CHANNEL INDEPENDANT
phase shift, thus introducing no phase difference between channels.
Furthermore, when the gentleman's tweeter was out of phase, the speaker
with the improperly phased tweeter (which could have been either speaker)
had a large zero in its frequency response due to the improperly phased
speaker.

The effects of a consistent
phase shift in both channels is not easily predicted,
which is the reason that I didn't try.  The effects are
dependant on many things, such as the ringing frequency,
magnitude, etc, and cannot in general be predicted.

They STILL do not have any relationship whatsoever to
the effect of a channel-dependant phase shift.

Good Grief again!