And I, as an owner of the same speakers you have, can tell you it works very well with music - I get a very satisfactory stereo image spread right across from one speaker to the other. The dipole radiation of the Maggies is a big help there; I can walk up almost to my plasma video screen, i.e., at the plane of the Maggies, and still hear the music spread in front of me. Mono material, e.g., announcer voices on FM, is fine as long as you're in the middle but off center it jumps to the nearer speaker. I think "phantom center channel" would do the same with mono stuff. Of course you can do a lot to correct any off balance sound from your listening position with the channel balance procedure on the remote control. Let us know how you like the 990 with the Maggies (what's in between), but I think you'll be very pleased.