are all amps equal

Tvad - you have much more experience with audio gear than I do, but it seems to me that there is some correlation between quality of the speaker and its price tag. Good transducers are expensive (tweeters included) and designer have certain constrains. Mentioned Lipinski's speakers (with "jaw dropping" imaging) would cost much more with extended bottom end.

I'm just saying that 30Hz doesn't come free and there might be better use for the money if music that you listen to doesn't require absolutely faithful reproduction of organs or double bassoon. I don't see how difference between 40 and 30Hz can change playback of bass guitar - I don't question it does, but just trying to understand it.

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!!!