My own view in matching subs to my Maggie MMGs is that a sub controller is very helpful in achieving seamless integration (I use the Velodyne SMS-1) and probably more important than the choice of sub itself. Duke's observations re: smooth response and multiple subs comport with my own experience. So, I'd go the multi-sub route and use an RTRA (Velo, Audyssey, SVS, etc) to - at least- optimize the hand-off.
Using this type of device I got great results both with a pair of Velo SPLR 8s and with a pair of Rythmik 12s. Note: The Rythmiks are clearly much better performers, but both subs were satisfying in seamlessly extending the bottom end of the MMgs.
I also use the digital room correction feature in the SMS, which complicates the set-up. Not for everyone, but I get great results.
Using this type of device I got great results both with a pair of Velo SPLR 8s and with a pair of Rythmik 12s. Note: The Rythmiks are clearly much better performers, but both subs were satisfying in seamlessly extending the bottom end of the MMgs.
I also use the digital room correction feature in the SMS, which complicates the set-up. Not for everyone, but I get great results.