I believe the M1 has three 100 W amps. I don't know if anything else was changed with this repair, just the main smoothing capacitors. Relays had been changed in 2010 and 2011.
M1 circuit 0-64 would explain the loudness and unpleasant feeling at over 60. I couldn't leave them at that for more than a second. Must be clipping.
The handbook says a dealer can select 0db (775mV) or -20db (77.5mV). I have been using the 600 ohm balanced line.
The handbook is at
100 Series scroll down the page and click on the thumbnails to view.
The 101b needs checking out and measuring levels. Perhaps the M1s need another expert technician's look as well.
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