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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
Subject: Re: Cancel speaker resistance?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 16 Sep 2002 13:09:32 +0100
NNTP-Posting-Date: Mon, 16 Sep 2002 13:09:35 BST
"Simon Byrnand" wrote in message
> "Ban" wrote in message
> > "Kevin McMurtrie" schrieb im Newsbeitrag
> > news:mcmurtri-345A65.firstname.lastname@example.org...
> > > Is there any advantage in using current to voltage positive
> > > cancel the coil resistance of a single speaker driver? Would
> > > eliminating the 5-something Ohms improve the sound or is it
> > > insignificant compared to other factors?
> > I have tried something like this. A normal bass-speaker has a
> > closed box, where there is a lot less current needed to get the same
> > then for higher frequencies. If you place a series resistor between
> > and gnd you can feedback the current.
> > It makes more sense to actually negatively feedback to get a very
> > output impedance, but the resonance has to be compensated. Now the
> > current is independent of the speaker impedance, which varies a lot
> > temperature. The compression due to temperature variations is
> And the frequency response of the speaker is entirely changed, since
> (all?) drivers are designed to give their desired frequency response
> constant voltage source, not a constant current source. Not only would
> get a big peak at the fundamental resonance, (which you suggest
> compensating) but a climbing output at higher frequencies.
> > This all makes sense only for very high-end sound systems with
> > crossovers and built-in amplifiers.
> 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.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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