The M3 is an excellent speaker and will no doubt play loud enough for you in that room size. Any Axiom speaker really is quite flat in their response, like others have noted, the M3 has a slight bump in the lower range provide a deeper response. The mids sound excellent and still contain the "Axiom" sound due to the same tweeter that is used in the M22.
The main difference is that you will get a warmer sound from the M3 than a "brutally honest" sound from the M22. IMHO this is perfect for a kitchen, because really, if you want to listen to MP3s, or less than stellar quality recordings in your kitchen, the W3 will sound better than the W22.
