I have an Antique Sound Labs MG S1 15DT and never run it in pentode mode (15 wpc). I only use the 5 wpc triode mode and in this mode I used the ASL to drive a pair of M3s which it did magnificently. I've switched to an M22 style speaker from Michaura which sure looks like and sounds like an Axiom speaker. Anyway, the ASL has absolutely no problem driving the M3s in 5 wpc mode (triode is simply sweeter and more accurate sounding than the 15 wpc pentode mode).
Your ASL also has an output for a sub. The M3s appreciate the low end assistance of a nice, fast and musical sub. (I use a Velodyne 8" which simply disappeared when paired with the wonderful M3s).
Enjoy your ASL, it is a drop dead wonderful, dead quiet, accurate, lushly musical integrated tube amp which is a perfect companion for the M3s.
