musical subwoofer recommendation for 2-ch

They have small woofers and so they are fast but do not have sufficient low bass.

Large woofers do not have to be slow. It boils down to motor voice coil diameter and magnet size and critical damped in design (basically this adds up to large size/cost)

Small woofers with small diameter but long voice coils get hot very quickly and you get thermal compression as well as distortion as they quickly exceed Xmax (linear operating range)...

Itball,

Thanks for sharing. That article was very interesting. My experience has also been that mid range seems to affect bass perception enormously. It has always puzzled me how even a blown tweeter (far from bass frequencies) will modify bass perception. I guess heavy bass percussion is just all over the frequency map even if most of the energy comes from the woofer....which is why it is such a telling test for speakers.

As Mr Blackburn states it may boil down to subtle cues in phase. It may indeed explain why two ways with small woofers generally have a better reputation for fast bass...they have one less crossover to worry about! It is certainly consistent with the logic that a cheap two way is a safer bet than a cheap three way. (i.e. to go three way it is better to go significantly up in cost or the two way remains better value)

Interesting and thought provoking - thanks

Since you're not biamping with the sub's amp, it may be possible that you've pushed your main amp too hard.

That would be my guess too.