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From: "Arny Krueger"
References: <firstname.lastname@example.org> <3Sjh9.email@example.com>
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 08:29:23 EDT
Date: Mon, 16 Sep 2002 12:29:23 GMT
"Kevin Aylward" wrote in message
> "Simon Byrnand" wrote in message
>> And I doubt they drive the actual speaker with a constant current
>> amplifier....(instead of constant voltage)
> 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.
Adding that resistor is clearly debatable, as I'm debating it at this
time with none other than Patrick Turner oven in the Australian audio
group. The idea gives him a major tummy-ache, needless to say!
What most of the rest of us can agree with is the idea that using a
hi-z amplifier to drive a loudspeaker with a varying impedance curve
is like adding an equalizer to the system. This equalizer can be made
adjustable in terms of the height of the peaks and dips by making the
output impedance of the amplifier variable.
Variable output impedance has been a feature of commercial power
amps. I believe that Bob Carver has designed SS power amps with this
feature - his favored implementation seems to be a resistor in series
with the speaker leads.
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