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Subject: Re: Speaker phase and current vs voltage drive
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Mon, 28 Oct 2002 02:30:23 GMT
NNTP-Posting-Date: Sun, 27 Oct 2002 18:30:23 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> Voice coils are usually spring suspended. Below the spring mass
> resonance, the voice coil displacement is nearly proportional to current
> (voltage also because the principle electronic resonance is much
> higher). Above the spring mass resonance, acceleration is proportional
> to current. This is really the nearly linear regime because sound
> pressure is proportional to acceleration rather than amplitude or
> velocity. Cross over is needed because the speaker may have to vibrate
> in a higher mode than the fundamental.
> ... The times have been,
> That, when the brains were out,
> the man would die. ... Macbeth
> Chuck Simmons email@example.com
What is the reason that speakers aren't current controlled?
I seem to remember some experiments done (a while ago) using
current-controlled amplifiers (i.e., transconductance). As I recall, the
problem was that the speaker enclosure resonances would have a bigger effect
on the response -- as compared to the same speaker driven from the low
output impedance of a voltage amp.
Any insight into this?
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