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From: John Woodgate
Subject: Re: Class B amplifiers: what are the large low-value resistors for?
Date: Fri, 15 Nov 2002 04:35:57 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 15 Nov 2002 06:17:49 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Phil Allison
wrote (in ) about 'Class B
amplifiers: what are the large low-value resistors for?', on Fri, 15 Nov
>"Trevor Wilson" wrote in message
>> > >**Not in this universe. There is only one brand of commerically
>> > >loudspeaker, which APPROACHES a resistive load. That brand would be
>> > Not entirely true, I think. Some of the KEF models had/have Zobel
>> > networks to make their impedances almost purely resistive.
>> **Not quite. I believe the Zobels were for the upper bass, lower mids and
>> lower treble. There were no Zobels to cover the bass humps.
> *** There was a version of the 104 that was resistive across the audio
>band. Series tuned circuits were used as conjugates to cancel out the usual
> The impedance was 6 ohm + /- 10 % 20 to 20 K
That was my understanding, too.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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