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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <firstname.lastname@example.org> <3Sjh9.email@example.com>
Subject: Re: Cancel speaker resistance?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 16 Sep 2002 13:52:52 +0100
NNTP-Posting-Date: Mon, 16 Sep 2002 13:52:55 BST
"Arny Krueger" wrote in message
> "Kevin Aylward" wrote in message
> > "Simon Byrnand" wrote in message
> > news:firstname.lastname@example.org...
> >> 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.
There is certainly some logic as to why a certain amount of resistance
might "improve sound". I typically *always* run with some mid cut,
around 600Hz to clean up a sound. Its inherent that any speaker system
rolls of on the top and bottom, not to mention aging ears. A typical
speaker impedance curve will often have a dip in the mid band so a
driving impedance could cause a dip in response in the midband of a few
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