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Subject: Re: Cancel speaker resistance?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 16 Sep 2002 08:53:06 GMT
NNTP-Posting-Date: Mon, 16 Sep 2002 10:53:06 MET DST
"Kevin McMurtrie" schrieb im Newsbeitrag
> Is there any advantage in using current to voltage positive feedback to
> 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 resonance in a
closed box, where there is a lot less current needed to get the same SPL
then for higher frequencies. If you place a series resistor between speaker
and gnd you can feedback the current.
It makes more sense to actually negatively feedback to get a very high
output impedance, but the resonance has to be compensated. Now the driving
current is independent of the speaker impedance, which varies a lot with
temperature. The compression due to temperature variations is eliminated.
This all makes sense only for very high-end sound systems with active
crossovers and built-in amplifiers.
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