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Re The Piezo effect on speaker wires and some

Posted by chris_w (A) on January 13, 2004 at 14:36:17

As the previous thread has become so fragmented I thought i would start a new one with a new point.

Whilst the argument about impeadances effecting the impluse signal which all sounds pretty resonable to me and asuming we have gotten the signal level correct is it uVolts mVolts or nearly volts with a 10meg ohm load.

One small thing we have sofar overlooked in the "discource" is: speaker wire in a real amp speaker config, is that if this noise is generated at a serficent level even with the low Z's of a amp-speaker setup, we have forgotten that any signal not produced at the output of the amp by the amp itself is not intialy subject to the closed loopgain of the amp care of the negative feedback loop.
But is subject to the full open loop gain of the amps NFB input point.
so even mVolts could endup with a much larger signal voltage at the speaker.
Although this signal would be quickly eliminated by the NFB's action but only after the NFB's loop delay compensataion has cut in (say two or three cycles for arguments sake).

Or am I barking ? -polite answers on a post card please. Rude ones will be ignored :¬)

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