Sub woofer that excels at the mid bass wanted

HSU Research makes the MBM-12 MK2 Mid-bass Module with a frequency response of 50 - 150Hz. Not expensive either.

You might consider the Focal Dome subwoofer that retails for about $895. My local dealer offered me at point for $500 and sent it home for a demo. It really sounded great, but didn't pack the punch that I wanted for home theater. It's designed to go with the small Dome speakers and is rated to 200 Hz. It has variable cross over from 50 to 200 Hz. Should be a perfect fit other than the price is a little steep.

IMHO, this is the range where subs do their best work, smoothing the room induced impact on FR. As you go really deep in pitch (say <35hz), a good sub will be outperform almost any integrated woofer, but (again, IMHO) this has less impact on the end result - due to the lack of info in this range on most source material. A sub may provide audible improvement way down there, but the "clean up" over 50hz can be truly dramatic.

I use 12" Rythmiks. Remember that a kick drum fundamental is usually >50hz. You shouldn't worry about small drivers at 100hz. The key is carefully matching level, slope, phase, etc at the x-over point. A good sub controller (Velodyne SMS-1, etc.) will make this vastly easier.

Good Luck,

Marty

Rel T2 or T3 subs, or the awesome Definitive Technology Supercube III (unbelievable bass from a tiny cube, very quick).

You might consider the Art of Sound Raptor subwoofer. I am running with the crossover at 100Hz with great success.