@stevecharm
The only maeasurable parameter that might, and I emphasize might, be involved here is the amplifier slew rate, that is, how many volts/microsecond can it increase?
Slew rate really doesn’t effect how “quick” the amp is, though it seems like it would. All slew rate tells you is how much wattage it gives for a frequency range.
If you have a slew rate of 24V/microsecond and you have 100W into 8ohm (~80 Vpp, ~28Vrms), that means it’s frequency range is about 48kHz (meaning it can accurately reproduce 86kHz sampling rate).
(2π • 48000 • 80) / (1,000,000) = ~24
It’s not 1:1 with the impulse/decay response.