Does M22s have front firing ports or they fire backwards towards the wall? May be a stupid question. But the reason I ask is.. I have my false HT screen frame structure (open at both ends, basically a structure made out of 2x4 studs) built couple of inches away from the front wall and I need to place the M22s in this frame on either side of the screen. I do not want to build this frame too far away from the front wall in order to save the viewing length. So, there may not be any gap between the back of the M22 and the wall which is covered with a 1" thick linacoustic sheet. In other words, this is almost same as hanging them on the front wall (that is treated with insulation)itself. Is this ok?