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In Reply to: RE: I know all that and you have'nt answered the question. posted by dcuhl on August 23, 2015 at 21:20:55
IDEALLY an amplifier has NO resistance so ANY current generated by the speaker as 'Back EMF' should be dissipated BY the speaker itself.
As the amps resistance to this current rises, the damping factor FALLS.
Are you game for a test?
Disconnect your cone speaker from your stereo. With NO wires attached, take your finger and 'thump' the woofer. NOTE THE NOISE.
THan? Take a simple piece of wire or even a paper clip and SHORT the speaker leads together, again with NO amp in sight.
Thump again.
You'll note how 'dead' the second effort sounds. This is the result of a very high, nearly infinite, damping factor. Well, very high, any way.
You've answered your own question.
Too much is never enough
Follow Ups:
I just read your post, and it brought back flashbacks. When I was a 20-something, installing commercial systems in places like schools, churches, factories, etc., it was pointed out to me that a second use of the classroom P.A. speaker was to listen in on what was going on in the classroom. Yes... the loudspeaker was used as a microphone as well. Makes perfect sense, I just hadn't thought of it before then.
:)
a LONG time ago, a buddy and I EACH bought a Radio Shack 3 Watt CB walkie Talkie. We were going to use it at WORK to stay in touch since we were both working as mechanics in a facility making integrated circuits. This was WELL before Radios / Pagers / Cell Phones.
Long / Short? If we were standing next to or below a PA speaker, the radio would couple INTO that system and you'd be 'on the air' for the entire plant! OOOOPS!
Too much is never enough
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