I'll be ordering a pair of M3tis within the next month. They're single woofer and the driver is of a substantial size for a bookshelf. Those are the driving factors behind my decision, it's a tradeoff between price and performance between the M3ti and M22ti. Will the dual 5.25" sound punchier than the single 6.5"? - yes. Will the single 6.5" move more air than the single 5.25"? - yes. I've got a smallish sized listening area, I'm not looking for large SPLs (I wear earplugs at concerts all the time now to protect my hearing) just for good tonality and to set up a quality, enveloping sound stage (as they say).

Bren R.