Sima SSW-4 4 Speaker Selector Type: Speaker Selector Color: Black Specifications: Listen to one, all or any combination of speakers at one time Designed for use with amplifiers up to 100 watts per channel Accepts up to 14 gauge speaker wire Flat frequency response from 20 Hz to 20 kHz for full range sound Left and right "commons" are isolated to work with all types of amplifiers Unique circuitry protects amplifier or receiver as well as unit and speakers from excessive power/volume Support..