damping factor

Slew rate is just as important(the amps ability to recover after a hard bass note).

I believe that you're correct - slew rate can give the buyer/user an idea of the power amp's bandwidth.
What you wrote was re. transient decay (post event) but slew rate is equally important for transient attack. Thanks.

I guess guys in Bombay don't like chicks in there forums...
Thanks Timlub.

could you please post this for me. Something is wrong with my setup and even after logging in.....while I can go to my page, it won't let me post::

In addition of all the above factors, an additional non-yet discussed aspect is one of designed speaker 'Q'. A very high 'Q' of say....over 1.1 will result in boomy or tubby bass, even if the amp has a 10,000:1DF. OTOH, a speaker which is critically damped will have good bass at a DF as low as say....5:1 or lower.
If the arguments in the above posts were 100% accurate, very few speakers would have good bass on tube gear. As Atmo points out.

Please read this and if you agree, post to the DF thread.
Thanks.............leo...............
not a problem (I hope everyone understands this post is not mine, i am acting as a transfer service here for Leo.)

Leo, please explain Q factor. I don't know anything about it. Also, how does one learn what a particular speaker's Q factor is? I don't think I've ever seen that data/spec reported. Thanks

Amps with low damping factors (high output imp) will have a Hz response curve that may not be flat and IS effected and influenced by the speaker load. -i.e. - you don't know the amps Hz response curve until you hook it up and measure it with the load. In ohter words, if you change speakers, you are kind of changing amps too.- Different beast. :) This effects how loud the amp plays at different Hzs. This is one of the problems with many tube designs esp. SETS and why you need speakers with very flat Z curves.

Q is a speaker's "resonance peeking factor". There is a Q for the bare driver and another Q for the speaker box with the driver installed. This is a measure of the output db at the resonant frequency of the driver and/or box. It has nothing to do with an amp's damping factor OR the speakers impedence curve. Q is measured and used in basic calclations for designing the speaker box volume and is usefull predicted bass responce.