Sub woofer that excels at the mid bass wanted


Greetings

Anyone here at audiogon knows of a sub brand or model that excels at the mid bass area? say 50hz to 90hz

I'm running Rega RS1 speakers as my mains currently. I'm looking to reinforce the mid bass attack, but it can't be boomy or sloopy with the Regas, the Regas are quick and tight.

Thanks for any recommendations.

Note:I don't want bigger mains to be able to take up the slack in this area....rooms to small, furniture considerations and etc.... AND I LOVE THE RS1's!!
mcgarick
I'm using a Velodyne Optimum 8 and crossing over at 100hz. Works very well for me.
Rega Vulcan sub (no longer made) is pretty good match in a small room.. very very long throw 8" woofer in sealed enclosure.. very musical sub. (I have one)
I have a pair of Rega R-1's and have used them also with the REL R-538, which I just bought... the REL is much much bigger and 'badder' than the Rega Vulcan but it can be tamed nicely and I could dial in a very exacting match to compliment any of my mini-monitors I choose to use with it, and the Rega R-1 sounds really really nice with this REL.. or vice versa... The REL augmentation makes the Rega R-1 sound much bigger!
HSU Research makes the MBM-12 MK2 Mid-bass Module with a frequency response of 50 - 150Hz. Not expensive either.