Hi mbroadus, It certainly appears the Mantle Mount MM540 would work with our SuperCinema 3D Array X and 3D Array XL sound bars. The mounting area of the sound bar adapter supplied with the MM540 should accommodate the distance between the the threaded inserts on the back of both the SuperCinema 3D Array X and XL sound bars. Connecting the speaker wires into both of these sound bars might be a bit tight, but since the binding posts on the back of the speakers are recessed, you should be okay.