Mojo, only on-wall version I have are M3.
As far as the M3 bookshelfs bass being overblown I just have not have had an issue. For me, the bass bump adds enough oomph for it to stand alone. There is also a subtle difference in the mid-highs between the M3 and M22 ... the M3 is more tamed if you will. As I said before ... it's a very pleasant sounding speaker.
The M22 is more unapologetic and It presents what's its given, ahhh unapologetically, but, as we discussed in other threads, needs a low end supplement.
