G24 actually, I have an Ultracurve Pro, which is one of the reasons I know about the room modes. It's actually a pretty cool device! Running pink noise and/or autocorrect, I can see how much the room is impacting on the sound. I've been hanging out on the Audio Circle forum on room correction and I've got some stuff I need to try to cancel some of the nastier room modes (bass trapping mostly).
Unfortunately, I can't stand the sound of the ultracurve permanently in the signal chain, so using its correction algorithms isn't such a good idea, although it gives me a pretty good idea what a flat sound would be like in the room. When the bass is fixed, it really opens up the mids, which is nice!
One of my issues with equalization is that the bass modes are substantially different even if you move the microphone a few inches. Sampling a bunch of locations, you'd make very different adjustments, altho you can average some of them for something that will work OK. The bass nodes are the worst, of course, and after treating as much as I can with traps, I could go for something like a PARC parametric equalizer to tackle the bumps in response that remain. The Parc is said to sound better than many of the digital solutions, like Tact. I mostly listen to LP's so I'm not living in the digital domain yet. I've been playing around with the parametric equalizer in the DEQ2496, and it makes a really impressive difference without mucking the sound up in adjacent octaves. If only the unit didn't make everything else sound flat & lifeless. In the signal path, even with no parameters engaged, it just sucks the life out of my music. Too bad!
I think I can tackle many of the worst ones with treatments, and use the UltraCurve to track how well I'm doing.
Dennis, I'm still scheduled to audition some Callisto's. I'm excited by what I've heard about the Green Mountain line, and a friend of mine who's an ex-Maggie owner also recommends them. I hope they live up to the buzz.
That said, I've invested 7 years getting the Maggies to sound great, so I'm a little discouraged to be starting all over again in a new space. Frankly, I'd rather listen to music than fiddle with equipment.
Thanks again all who responded!