Musica VC50Z 50 Watt Stereo Impedance Matching Volume Control (Discontinued by Manufacturer) Knob Volume Control Level Control In 3db Increments 50w-70w Rms Impedance-matching Capability Of 1x, 2x, 4x & 8x Includes White, Ivory & Almond Decor-style Plates Precision level control in 3dB increments 50 watt rating Impedance-matching capability of 2x, 4x, and 8x provides flexibility in system design Low profile styling is a favorite of architects and designers 1x setting allows use as a standard 8 ohm non-impedance matching volume control