Thanks...
Phase 1 of the study is ended. It's obvious that I should have originally purchased M3s instead of the M2s. Oh well.
Now onto the more difficult Phase 2. Do I buy M3s ? M40s ? Go back to the Atoms ? Haul the M60s back up into the bedroom and pile a bunch of boxes around them so they don't look so big ?
M40s still seem like the perfect choice -- I imagine they would sound great at the levels I want, and rather than a small bass "hump" they have a really smooth extended bass down to ~40 Hz.
Unfortunately Phase 2 is going to require hauling everything downstairs so I can compare with M60s. If I test upstairs and carry the M60s upstairs for A/B testing that's going to prejudice the outcome, there's no way I'm carrying them down another flight of stairs after that
Then again if I had budget for new speakers I guess I would have bought M3s or M40s already.
Sigh...