My, welcome. No, the M22s won't change with time and you don't need to look at another speaker. One of the strong points of the M22s is their very clear mid-range which gives excellent reproduction of the vocal range, among other things. In fact, one of the few criticisms occasionally heard about them is that they're too "upfront". Unless your previous setup had an unnaturally elevated mid-range, which you'd become used to, it's difficult to analyse your report.

-----------------------------------

Enjoy the music, not the equipment.