Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
The corner you have may or may not be suitable. I suspect that it is fine; If I interpreted your description right, you have almost 4 feet before the first opening. There are lots of happy π cornerhorn owners with much less optimal conditions than that.
As for selection of speakers, I'd suggest the Theater seven π because it is a conservative choice. I know it will work well with your amp. The Thermionic six π is also going to work well with your amplifier, and it is purpose-designed for tube amps, reminiscent of the sound of the forties and fifties. If you have the time and budget to experiment some, the Theater three π and the Stage seven π would be great to try, but they need a bit of drive to control the woofer properly.