Is M3ti rear ported? If so, would it cause placement problem as surround by wall mounting?

Thanks.

Until you get an 'official' answer, I recommend searching through previous posts. Ian has made a few posts about suggested spacing for wall mounting (I don't remember the detail myself.)
-Steve

The M3 is rear ported. You can mount them on the wall as long as you leave about 1 1/2" of clearance to the wall.

Ian Colquhoun
President & Chief Engineer