Passive sub for Magnepan 3.6r?


Intrigued by the fanatical praise for the Magnepan line, my buddies and I finally got the chance to audition same at length. The 1.6s were fairly engaging, though a bit bright to my ears, and wholly lacking in low end slam--overall there's a number of conventional dynamic speakers I'd choose for the same $$. The 3.6rs, however, truly are as awesome as their cult proclaims--they reproduce drums and vocals as well as anything I've heard and are incredibly transparent. We did an A/B comparison of the Maggies to comparably or higher-prices B&W Nautilus and Thiel floorstanders, and it was absolutely no contest--next to the Maggies, the others sounded veiled and boomy.
All that said, and with due respect to those that enjoy the 3.6rs w/o a sub, we all felt that the 3.6rs lacked bottom end impact and were, in effect, 80% of a great speaker. We then added a REL sub (as is often recommended), but still struggled with the integration--no matter how we adjusted the sub, the combo still sounded like two separate speakers, not an integrated whole.
So my question is, assuming I take the plunge, would the Maggies be better served by pairing with a passive sub? My concept, as yet untested, is that by using the same amp to power both the sub and the Maggies, I might get a less distorted, more seamless sound. While I'm sure this topic has been addressed somewhere, your informed opinions would be most appreciated.
loomisjohnson
Dual subs are the way to go. Jimburger, have you tried putting your subs on sub-platforms? I put mine on 4" thick solid wood which are brass spiked into my floor, with the subs spiked into the sub-platforms...THAT was a HUGE improvement in sound...more definition, less boom and better slam. The response improved so much that my system sounds as good in the bass as my W/P 6's did in my previous system.
Jimburger, tell more about the dual subs in terms of the sonics. I have talked about this with Richard Vandersteen as a side bar to seeking an upgrade for my 2W. He advised me that adding another old 2W would provide better performance than upgrading to the 2WQ.
Hoping to revive this decade-old thread. I'm intrigued by the initial intent:

would the Maggies be better served by pairing with a passive sub? My concept, as yet untested, is that by using the same amp to power both the sub and the Maggies, I might get a less distorted, more seamless sound
I have a couple passive subs & a pair of 7B SST2 monoblocks. It would seem a good foundation for quality subwoofer integration would be found tapping into the monoblocks, no? 

Anyone out there with experience to share?