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When you push on a speaker while monitoring the terminals you get what is known as a Back EMF.

I don't believe that term is used much in the Audio industry but since you brought it up. :blush:
 

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The back emf creates damping factor in the amplifier, higher factors with lower input impedance.
Damping factor is the ratio of the source impedance of the amplifier to the impedance of the speaker.
 

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Decent explanation of damping factor, though they imply it's a bigger deal that it actually is.
SS amp manufacturers tend to do so, because SS has higher damping factor than tube. OTOH the Crown document doesn't mention the fact that all direct coupled SS amps have high damping factor, so it's nothing unique to Crown by any means. This is a much more balanced view, as the writer has no horse in the race:
http://www.diyspeakers.net/Article/Richard Pierce DAMPING FACTOR.pdf
 
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