As the OP, I have to say first of all that I listen to pretty much only classical music. OK, a bit of jazz here and there. I find the bass on the 20.7’s not only adequate but PERFECT really. I think my original idea to supplement them with subs comes from the fact that I CAN (financially anyway), and also from the fact of my never ending need to "improve" things. So I’ve pretty much decided not to invest in a pair of subs because I'm rather convinced that I would simply be creating more "problems" to solve. There are folks in this thread who really know more about what they’re talking than other folks but its up to you dear reader to DISCERN that. Just remember, more experience = better advice. @jafant The only other development is that ODDLY, I have gone back to the Aesthetix Atlas as my amp of choice with the Maggies at the moment. I’ve gone back and forth between the Atlas and the Pass X150.8 (also thinking that perhaps I should move up in the pass line to a more powerful amp). But the Pass product is SIGNIFICANTLY warmer in the midbass. The Atlas is incredibly airy, perhaps a very slight TINY smidgen "clinical" but still very very good. I did think about attenuating the midrange panel using a resistor on the 20.7s with the Pass to see what that would do and I may still experiment with that. There’s absolutely no doubt that the Pass did WONDERFUL things for my Thiel 2.4s but I don’t like it anywhere near as much with the Magnepan 20.7s, MUCH preferring the Aesthetix Atlas as my amp at the moment.
Magnepan 20.7 and Subs
I've been reading about supplementing my Magnepan 20.7s with a sub, the general preference being REL. However in room I'm getting fairly deep bass with the 20.7's, so my sense is that I would put the crossover on the REL pretty low, probably at 30Hz, leaving only sub 30Hz material porting "also" to the sub to augment the natural deep bass of the Magnepans. I'm just wondering since there's precious little info in the 15hz to 25hz range, do I really need a PAIR of RELs, or could I get by with just one? And shouldn't that one be capable of going REALLY low, like the G1, or what's the point? Any advice would be appreciated. Thanks.