I made it to the event and just wanted to give a short report on my impressions of it and the speakers. After the event, I read an Absolute Sound review of the Magnepan 30.7s linked below that not only was very similar to my impressions of their sound but the picture of them looked exactly the same as the ones played at the event. The 4 sections, 2 panels per channel, were a very nice blue color with off-white cloth fabric covers.
Magnepan's Marketing Director, Wendell Diller, was there demonstrating and discussing the speakers in groups of 4-6 people each. His main emphasis was the Power Response abilities of the 30.7 speakers which was very similar to this You Tube video I found:
I noticed they used a newer looking Anthem amp to drive these but, sorry, I didn't catch the model number. It was black with a blue numeric digital volume display if that helps. The room was about 15' x 20' with the panels about 6-8' out from the front 15' wall. There were no sweet spot chairs so we were all standing and Wendell suggested we walk all around the room to listen, even behind them. They sounded great wherever I listened with better dynamics than I remember from the 20.7s.
But they're $30K/set, so I only order one.