Charles, I tried a matching M5 center when I had the M5s set up in my main space. I didn't like it. Maybe if it was behind a screen it would have been better.

Philip, as I reported in other posts, I had to cut the bass on my M2OW. I use dual subs to take over at 80Hz. This is most definitely a room interaction. You may have to do the same thing. The M2 bookshelves, which I had 2.5 feet out into the living room, needed no such adjustment and didn't need subs. They did get in the way though. Now the living room looks real clean. A real pleasure to sit in that room and work or space out. It took me 6 long years to make it mine!

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated