thanks for the articles. Im assuming the M3 onWalls and M3 inWalls are very close in their sound characteristics. It would be interesting to see a set of X & Y axial graphs at a few frequencies

Thinking of using onWalls but have not rule out inWalls ... for me the decision between the 2 has nothing to do with reproduction but more with trying to meet Massachusetts electrical code and optimizing sound proofing. These conflict a bit And I have not completely sorted out all the issues