In addition to the good points that have been made above, it should be kept in mind that extremely high amplifier damping factors are meaningless in typical setups, because from the woofer's perspective damping is also limited by the resistance of the speaker cables and the resistance of the inductor in the crossover.
A 10 foot run of 12 gauge speaker wire, corresponding to a 20 foot round-trip for the signal, will limit the damping factor to about 250, even if the amp's damping factor is infinite. Crossover inductor resistance is often much more significant than even that, and I believe in many cases will limit the damping factor to well under 50.
Regards,
-- Al
A 10 foot run of 12 gauge speaker wire, corresponding to a 20 foot round-trip for the signal, will limit the damping factor to about 250, even if the amp's damping factor is infinite. Crossover inductor resistance is often much more significant than even that, and I believe in many cases will limit the damping factor to well under 50.
Regards,
-- Al