In his last years, Frank enjoyed a private stereo system that was pretty much on all day. Low level, near field, usually Philharmonic speakers, and his choice of any AVA amp. He tried most of them, at one time or another, but definitely liked the mono blocks best. Better than the hybird fet-value, better than the ultra-valve tube amp, and certainly better than any class D amp that was ever tried. He did like the NP1 / CA1 amps, a lot, but preferred the M225's and M750's. I asked him once if he could tell a difference and he said "yes", he liked the M750's best.
That was Frank, I can't tell the difference.
Just as as FYI - The M750 came first, the M225 followed. The design goal of the M225 was for what you are describing: for the homeowner who is driving a "reasonable" pair of speakers, at "reasonable" volumes, in a "reasonably" size room with "reasonable" acoustics. One who doesn't need the massive power of the M750. In other words, the M225 is a smaller, cost reduced M750. However, if you can tell a sonic difference and think the M750 sounds better (as Frank did), all bets are off.
Dan