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Motional feedback in speakers
On Thursday, November 7, 2019 at 4:32:20 PM UTC-5, Trevor Wilson wrote:
Regarding feedback, I remember there was an hobby project long ago to have a very small R between speaker and GND (GND also being the amp's ground), and using the speaker's back EMF as feedback to correct excursions. There are some later publications from W.Kippel about it. **The first system I saw with that arrangement was the Infinity RS1. It introduced as many problems as it solved. Amplifiers with 'floating' output stages encountered some problems. Bridged amplifiers too. That said, the bass extension available from a rather modestly sized, sealed enclosure was impressive. May well be the case, but it wasn't because of feedback. If there was anything done electronically, it was EQ which, itself, is a completely legitimate way of getting bandwidth, if done properly*. * Which, of course, is subject to Dick Pierce's First Law of Acoustics: Anny idiot can design a loudspeaker and, unfortunately, many do. |
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