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From: "Arny Krueger"
References: <firstname.lastname@example.org> <3Sjh9.email@example.com> <0Aqh9.381$HT1.firstname.lastname@example.org> <3D868192.F61269AB@webaccess.net>
Subject: Re: Cancel speaker resistance?
Organization: www.pcavtech.com & www.pcabx.com
X-Newsreader: Microsoft Outlook Express 6.00.2479.0006
NNTP-Posting-Date: Mon, 16 Sep 2002 21:38:58 EDT
Date: Tue, 17 Sep 2002 01:38:58 GMT
"Chuck Simmons" wrote in message
> Arny Krueger wrote:
> > "GregS" wrote in message
> > news:email@example.com
> > > In article <0Aqh9.381$HT1.firstname.lastname@example.org>,
> > > Krueger" wrote:
> > >> "GregS" wrote in message
> > >> news:email@example.com
> > >>> In article , John
> > >>> Devereux wrote:
> > >>>> "Kevin Aylward" wrote:
> > >>>>
> > >>>>>
> > >>>>> I agree. A pure current drive would sound dreadful.
> > >>>>> inserting a resistance of the order of 4-10 ohms to mimic
> > >>>>> type output impedances has, debatable maybe, been
> > >>>>> to "improve" sound.
> > >>>
> > >>> I don't think output Z has anything to do.
> > >>
> > >> It does. It can effectively add an equalizer in front of the
> > >> electrical input to the speaker.
> > >
> > > I forgot about that. But each speaker load would change
> > > differently and sound different, but not necessarily go into
> > > tubed sound.
> > I've studied quite a few impedance curves, and they do strongly
> > to follow a pattern. Peak in the LF range dip, Peak in the
> > range, dip, peak at the high end.
> > http://www.pcabx.com/product/amplifiers/mag%20left_hi.gif
> The first two peaks are mechanical. The first peak is the first
> principle mode of the diaphragm and suspension. Very small speakers
> don't have the second peak which I suspect is due to the second
> principle mode of the diaphragm. The third appears to be electrical
> rather than mechanical because it is present in voice coils not
> attached to diaphragms. A voice coil with a stiff mass load and a
> suspension has only two peaks corresponding to the spring mass
> and to the self resonance of the coil and stray capacitance.
I guess I didn't mention that it's a 2-way speaker.
The midrange peak relates to the crossover, voice coil inductance of
the woofer, and the fundamental resonance of the tweeter.
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