I thought my room might be like yours with the shelves and small size - but I have a rug and some wall hangings and to much furniture to make the room accentuate the high notes on the M22s. They both sound great here - the M22s sound more detailed and smooth I think.
I am not going to try them side by side - I need to send the M3s back to get the refund and it is too much work getting behind the reciever in the small corner it is in.
But, in the first hour of transition I thought the M2s were smoother, clearer and more detailed. Not night and day but maybe late afternoon and midday.
