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RE: "Back-EMF"

I must disagree. it is NOT the resistance of amp/ wiring which enables self damping but the LACK of such resistance.
A demonstration?
Take a woofer just sitting on your bench...for ease of getting at the wiring.
Thump it with a finger and it's gonna make a noise.....
THAN, bridge the woofer with a piece of wire. NOW when you thump it, the woofer self damps and makes far less noise. The current generated is now opposed by the magnetic field, not dissipated in amp resistance. That is why LOW output impedance amps have HIGH damping factor.
All else, about the magnetic field causing a field which opposes such motion seems to be in order.

As a further demonstration, put a 1 ohm resistor in series with your speakers. Changes 'em, right?
You just dramatically dropped the damping factor and should be able to tell by ear.


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