The WMM450 is a fireproof speaker back box for in-wall and in-ceiling installations in hollow structures. It is constructed of electro-coated steel and allows the installation of all types of flush-mount speakers with a built-in depth of up to ~115 mm.

It provides an ideal environment for installed speakers while preventing unwanted sound leakage into neighboring rooms. The 446 x 455 x 127 mm dimensions allow it to be placed between a wide variety of wall studs or ceiling beams. It has an internal volume of 15 liters and comes pre-installed with sound-dampening material for optimal acoustic performance.