S.H.
Funny that you mention DIY MTM speakers. That is what I have. Seas Excell magnesium drivers, with a DiApolito designed crossover, internal wired with Kimber. I'm not sure about the efficiency, probably 88-90db.
I opted for the Aleph 30 over the 3 because of better bass impact, lower noise floor, and slightly less current draw (only 200w). The sound is simply unbelievable. Have considered upgrading but haven't heard anything better for the $$. The only upgrade would be the Aleph pre. I have a Cary 308 cdp and I have had the Cary/AES pre and now have an Audio Refinement(tube sounding)pre. Beautiful synergy but I understand the Aleph prehas perfect synergy with the amp. The price is holding me back, though.
SH, Email me if you want or post here.
Mike