Sounds like a great plan and you would be surprised by the amount of base the M22's are capable of, it's just that it tends to get overshadowed by the detail that the 22's have and alot has to do with the recordings. Not that a sub doesn't fill it out even more but they do play well into the 60hz range.
Here is quote from post that ctown did a little while ago..
"When I auditioned at Jakewash's place it was so true about his M22's. I played some Bob Marley and it was recorded with a heavy bass track that no way the speakers sounded "lean" as some would say. Conversely, Neil Young's live recording from the CD "WELD" really revealed the less than optimal recording."
