I don't think the lows between the M3s and M22s are any different from a technical perspective. However, the M3s sound like they have more bass because the mids are depressed. And the mids aren't really depressed on the 22s but rather they are depressed relative to the highs. Maybe by the time I'm ready for bookshelves, the 22s will have been improved.
Come to think of it, they audiobytes may be all that I need because based on the pdf that Amie posted, it appears they'll sound as mellow as an M3 but detailed like the 22s without the higher end detail...which would make them perfect for background listening. Of course they'll be less efficient but that's not of primary concern for my living room space.
