Aleph 5 50 nominal is the damping factor
Aleph 3 100 nominal is the damping factor
SF Power 2 100 damping factor
ML 33 greater than 800 @ 20 hz, this is a very good figure to look at as this is typically where you want the greatest control of the drivers, in the low bass region. The Aleph products because they don't over control drivers are considered more tube like. Tubes also don't control drivers as well as SS.
This didn't answer your question about DH but should give a reference on Damping Factor.
Aleph 3 100 nominal is the damping factor
SF Power 2 100 damping factor
ML 33 greater than 800 @ 20 hz, this is a very good figure to look at as this is typically where you want the greatest control of the drivers, in the low bass region. The Aleph products because they don't over control drivers are considered more tube like. Tubes also don't control drivers as well as SS.
This didn't answer your question about DH but should give a reference on Damping Factor.