Monoprice 6-Channel Speaker Selector - Black With Impedance Matching Protection, Up To 140W Per Ch. Perfect for Home Theater Audio Spread your sounds around your home or business with this Monoprice 6-Channel Speaker Selector! This speaker selector allows you to connect up to six stereo speaker zones Built-in impedance-matching circuitry ensures that the overall impedance level to the amplifier does not drop below 5 Ohms no matter how many speaker zones are selected or how many speakers are in each zone