I don't want to argue with JohnK, but, I think there are noticeable differences in sound quality among different amps.

My M22s really opened up and sing when driven by a vintage Harman Kardon PM 665 integrated dual mono amplifier.

I had good results with a flagship Kenwood KA9100 integrated amp.

I did not have good results with a 5 wpc SET tube amplifier.

I did not have good results with a Sony STRDB 1070 when used as a 2 channel integrated stereo amp/receiver.

Good luck.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.