Zman did get me thinking and motivated to further explore positioning. I did a lot of positioning work a while ago to get the right room reinforcement for quality and quantity bass. Yesterday I gave up the bass quest entirely and embarked on a quest for soundstage depth. I moved the speakers out into the room about 2 feet more and about a foot further from the sidewalls. Indeed, the soundstage depth expanded greatly, and the bass suffered. I think I'll keep it in this configuration for a while, as I have the space with my current setup. It's not as nice and tidy as when the speakers were closer to the corners, but I do like the much much greater soundstage depth. It's helping a lot with both my high quality recordings as well as the lower quality ones - the music has more room to "breath", so the layers of the music aren't compressed on top of each other nearly so much.
As a result, I have re-engaged my subwoofer with room EQ, and while the bass isn't as coherent and will take me a while to tweak until it's just right, it's there in the right quantity to keep the system full-range. I'm not having much trouble with the speakers disappearing for the most part, although I bet some high quality monitors may do a better job of that. I do intend to do the cabinet and driver resonance tweaks, which I am told should reduce the sound of the cabinets and help them to disappear even more.
As a result, I have re-engaged my subwoofer with room EQ, and while the bass isn't as coherent and will take me a while to tweak until it's just right, it's there in the right quantity to keep the system full-range. I'm not having much trouble with the speakers disappearing for the most part, although I bet some high quality monitors may do a better job of that. I do intend to do the cabinet and driver resonance tweaks, which I am told should reduce the sound of the cabinets and help them to disappear even more.