Greetings:My recent experiences with motion control, coupled with an interest in audio, have led me to the following question:Why aren't speakers driven closed loop? Ie, have a position sensor on the speaker diaphragm, and drive the speaker in a servo loop?I realize this would be challenging particularly for tweaters (which also don't necessarily exhibit "stiff" diaphragm movement), but the concept is more of what I am interested in.Has this been done? It would seem to be the "holy grail" to have the speaker cones move in lockstep with the signal waveform.Just pondering.Good day!-- _______________________________________________________________________Christopher R. CarlenPrincipal Laser/Optical TechnologistSandia National Laboratories CA USANOTE, delete texts: "RemoveThis" and "BOGUS" from email address to reply.

It has been done - some years ago Philips used to sell loudspeakersthat worked on this principle. They weren't all that good, probablybecause the position of the diaphragm is measured at one point, and thediaphragm, not being infinitely rigid, distorts under load.IIRR Philips used an accelerometer mounted on the drive coil as their"position" sensor.-------Bill Sloman, Nijmegen

Why not closed loop speaker amplification?

Jun 07, 2005 41 Replies

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Jim Thompson 21 years ago

Bwahahahahaha! Marvelous!

...Jim Thompson

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Dave 21 years ago

What the point of developing sophisticed electronics to improve sound quality, when there are enough fools willing to part with their money with pure hype?

I think this author has hit the nail on the head.

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