it's just I'm used to a little "brighter" sound and these little guys push out a lot of bass
The M3s do have a slight bass hump at aroung 100Hz giving them a bigger 'bass sound'.
From your description above, you would be much happier with the M22. Changing out the speakers is going to have a
much bigger impact than changing out the receiver.
In the bigger picture, is it worth an additional $50 (return shipping cost) to get the sound you want.
Is there anybody in your area with a pair of M22s that you could audition?