An electrical device mounting assembly for recessed mounting of high and low voltage components in order to provide electrical power and low voltage signals to a television or home entertainment center is provided. Mounting surfaces are provided within the mounting assembly to recess electrical components therein and behind the wall surface. The assembly includes a mounting frame for receipt of mounting devices such as high voltage boxes and low voltage mounting plates. The mounting devices are secured at an angle with respect to the mounting frame, thereby minimizing the depth of the mounting frame while providing sufficient space for recessing plug ends of electrical cords and terminal ends of signal cables within the wall. The electrical device mounting assembly provides a recessed area on a wall for mounting all the various electrical and signal hookups for a television or home entertainment system.