No, Nick, we haven't treated our listening room, although I suspect, because you've responded to a few of my recent other postings, that you think that's where money and time might be better spent. I guess the reason most people don't go for the acoustics solution is because it seems so much more difficult and involves lots of trial and error; most people would rather find a solution that just involves plunking down a piece of equipment.
Another problem: acoustic solutions don't seem to be very wife friendly.
That said, I thought we had a pretty good room for acoustics: High, vaulted, wood, beamed ceilings; carpet on the floor. The room is about 18 x 18. Perhaps the problem is the amount of windows in the room; one big, long one behind the speakers, another decent-sized one off to the side. Echoing isn't a problem. Maybe I should call in an acoustics expert. Is there such a thing for houses?