The Mighty GM70 plays in Open Baffles
Here's the "Dowdy Llama's" GM 70 which is the finest sounding amp I could ever hope to hear. Heard it last year at Hornfest 09 and will hear it next month at Hornfest 10. It was a near religious experience for me when the GM 70 parted the heavens. This monster amp costs over $30K and will heat your house in winter.
I know I'm a little smitten with Open Baffles right now but it's interesting that Dowdy chose OB speakers to showcase his masterpiece. Of course the WE754 drivers in those OBs are highly sought after and in a class by themselves.
http://www.youtube.com/watch?v=eb_TDsXQkPc&NR=1