Leviton By Bose White Soundshaper Audio Volume Control Speaker impedance (Ohms): 2-16 Standard single-gang design with a mounting depth of 2.5 inches Detachable cable connectors are compatible with all standard speaker wire sizes (14- to 18-gauge) Automatic impedance matching for trouble-free installation Frequency response: 20Hz-20KkHz +/- 1dB (with SoundShaper circuit "out")