Hello Al.
Thanks for the excellent and thoughtful reply. I've gone through it several times in the last couple of days.
You made it very clear so I can work through the tradeoffs. Maybe running the amp up to 50% si not as offensive? Something to try and learn.
I think most of my music is going to be rather compressed. Of course I have some good recordings, including Telarc's Firebird you mentioned, but the majority of my listening is going to happen with lesser quality recordings. Let alone having 3 kids into teenagehood and wanting to share some listening time with them, with their music ;-)
FWIW, I'm working on the midrange driver. It's a horn-loaded cone, so efficiency is yet another tradeoff in the design. I believe 100dB/W is about a floor, and probably a cieling around 106dB/W. Hopefully I can get it to 103-104dB/W and then things start to look significantly better. Or I'll have to settle for a 2A3 or higher power amp.
Glad to see a healthy thread develop on SETs. I'm hoping that eventually more people will be open to try what well-implemented DSP can do for a system (emphasis on "well-implemented"), just like Charles was open to experience well-implemented digital. Not saying it will be best for everybody, but I find it a pity people follow so many preconceived notions in audio and preclude themselves from trying new things. OK, time to get off my soap box :-)