From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Cancel speaker resistance?
References: <email@example.com> <3Sjh9.firstname.lastname@example.org> <0Aqh9.381$HT1.email@example.com>
Date: Tue, 17 Sep 2002 01:12:31 GMT
NNTP-Posting-Date: Mon, 16 Sep 2002 18:12:31 PDT
Arny Krueger wrote:
> "GregS" wrote in message
> > In article <0Aqh9.381$HT1.firstname.lastname@example.org>, "Arny
> > 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. However,
> >>>>> inserting a resistance of the order of 4-10 ohms to mimic tube
> >>>>> type output impedances has, debatable maybe, been considered
> >>>>> 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 tend
> to follow a pattern. Peak in the LF range dip, Peak in the middle
> range, dip, peak at the high end.
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 spring
suspension has only two peaks corresponding to the spring mass resonance
and to the self resonance of the coil and stray capacitance.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org