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From: mbk@jacobi.UCSD.EDU (Matt Kennel;I11 CMRR;534-4511)
Newsgroups: rec.audio.high-end
Subject: Re: Subwoofer Building
Message-ID: <11070@uwm.edu>
Date: 16 Apr 91 12:34:02 GMT
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In article <11040@uwm.edu> km456265@longs.LANCE.ColoState.EDU (Kevin Melsheimer) writes:
>Your fifth question asks about dual-voice coil subwoofers.  These units
>sole purpose in life is to be driven by an amplifier that fails to have
>the capacity of beign bridged into mono.  I would not recommend using a
>dual voice coil woofer if you are a true audiophile.  The bass will get
>quite distorted if the bass from the two channels being input are
>different from each other.  This is due to the speaker trying to go in
>two directions at once--the net result is distortion.

This is bogus.  All that happens is that the forces generated
by each coil ADD.    Remember  _Sum_ (\vec{F}) = ma.  The forces are
being applied in the same place.

You're not going to create enough force to physically rip apart the
coil assembly, so don't worry about it.

It has the same effect as if you added two low-level signals together
(via some type of amplifier circuit) to create a monophonic signal, and
then amplified that and passed it to the speaker coil.


(It's possible that there may be odd electrical effects as there's a 
 mutual inductance between the two coils, so it may screw up a badly
 designed amplifier.)

Matt K
mbk@inls1.ucsd.edu