From: John Woodgate
Subject: Re: Cancel speaker resistance?
Date: Mon, 16 Sep 2002 17:25:07 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 16 Sep 2002 18:09:22 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Simon Byrnand
wrote (in <firstname.lastname@example.org
.nz>) about 'Cancel speaker resistance?', on Mon, 16 Sep 2002:
>nd the frequency response of the speaker is entirely changed, since most
>(all?) drivers are designed to give their desired frequency response with a
>constant voltage source, not a constant current source.
No, not all. KEF, for example, had some constant-current products years
>Not only would you
>get a big peak at the fundamental resonance, (which you suggest
>compensating) but a climbing output at higher frequencies.
The voice-coil inductance tends to counteract that, if the current
source is not TOO constant.
>> This all makes sense only for very high-end sound systems with active
>> crossovers and built-in amplifiers.
>And I doubt they drive the actual speaker with a constant current
>amplifier....(instead of constant voltage)
It has been done; see above.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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