I wonder what the criteria would be to anechoically test an on-wall speaker. I mean, since it is designed as an on-wall application, do you test it in the chambre with a section of wall? how big an area? how thick? what material?
I know there is a protocol for it. Not sure of the specifics of the build of the wall, but it's probably to contribute as little as possible to the FR of the speaker. The test is referred to as π anechoic, where as the normal test is 2π anechoic. That's because pi (π) radians is 180°.
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs