Discussion
Why does negative feedback improve an amplifier's damping factor?
Answer: A
Voltage sampling at the output makes the amplifier work to hold that voltage steady whatever the load draws, which divides the output impedance by one plus the loop gain. Current capability is set by the devices, the loudspeaker's resonance is its own property, and the load is what it is. That the same feedback which reduces distortion also raises the damping factor is one mechanism producing two apparently unrelated improvements. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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