With the Monster Cable Speaker Selector, you can enjoy the convenience and flexibility of listening up to four speaker pairs at a time, in any location. With Monster's advanced Amplifier Protection circuitry, you'll have the comfort of knowing your amplifier is delivering maximum power and performance. When engaged, this impedance matched circuitry maximizes high power amplifier performance and allows you to safely use up to four speaker pairs simultaneously without overloading or damaging your amplifier. The Monster Cable Speaker Selector features high quality materials for maximum reliability and durability, Non - inductive 50 watt resistors with aluminum finned heat sinks are specially designed to deliver peak power from even mega-powerful amplifiers - up to 150 watts per channel . These precision - crafted resistors improve frequency response, so you'll enjoy fuller, more three dimensional music reproduction. And, all the connections to the circuit board are completely wired with high performance Monster Cable for the best possible sound.