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Path: utzoo!utcsrgv!spoo
From: spoo@utcsrgv.UUCP (Suk Lee)
Newsgroups: net.audio
Subject: Re: need help w/ Hafler circuit
Message-ID: <3007@utcsrgv.UUCP>
Date: Thu, 29-Dec-83 12:48:38 EST
Article-I.D.: utcsrgv.3007
Posted: Thu Dec 29 12:48:38 1983
Date-Received: Thu, 29-Dec-83 13:34:11 EST
References: <295@mddc.UUCP>
Organization: CSRG, University of Toronto
Lines: 41

You have the Hafler circuit set up
properly.  The sound is faint for
two reasons:  the amount of out-of-phase
              information is less than
              the amount of in-phase,
              so the third speaker
              (which is playing out-of-
              phase stuff) is quieter

              and

              your third speaker could
              be less efficient than
              your main speakers.

However, it's not too important that
the third speaker is quiet.  The way
to adjust the Hafler circuit is to 
wire an "L-pad" in series with the
third speaker (so that you can adjust
the volume), and decrease the volume,
with the main speakers playing,
*JUST* until you can't hear it from
your usual listening position.  You
may find that the Hafler circuit
doesn't seem to do anything when you
set it up this way, but try disconnecting
it while the music is playing:  the
sound field "collapses" back to 
ordinary stereo.

Concerning safety: as long as the third
speaker isn't of terrifically low
impedance, everything should be okay.

Good listening.

From the pooped paws of:
Suk Lee
..!{decvax,linus,allegra}!utzoo!utcsrgv!spoo