are all amps equal

Tvad & Kijanki -- I think that you are both basically right, and the key to reconciling your points of view is that bass volume and bass distortion have to be factored in, as well as bass extension (which may be specified on a small signal basis, and may be specified without meaningful specs on distortion at high volume).

And I think you'll both agree that providing bass that is simultaneously clean, undistorted, deep, and high in volume, requires big drivers (at least 10-12 inches, or else equivalent multiple smaller drivers), which means bigger cabinets, and both the larger drivers and the larger cabinets tend to result in higher cost if quality is not sacrificed.

Regards,
-- Al

Tvad - I'm just trying to understand what makes the difference. As for the lack of correlation between price and quality - are you saying there is none and everything is just random? Can one purchase $1k speaker as good as $50k speaker?

TVAD is an audio god!!!

well, this is all very interesting and food for thought, and not that it matters in this discussion, but I do have an
8 inch Velodyne (130 watts). I sometimes use it with the Ushers, even though it only goes down 40 hz,it does add to the fullness of the sound. My room is about 12 by 15 so the combination fills the room very well.... Thanks for all the info....

Keslerd - Do you think it adds extension, definition, amplitude, punch or all of the above?