The Speaker-Level Audio Source Selector by Impact Acoustics adds functionality to your whole house audio system. Whole house distributed audio is becoming more common in homes today but you don?t have to abandon your ?old? stereo audio equipment. By simply adding our audio source selector you can switch between the distributed audio source and a stereo in your room. Put your college system to work again or use the receiver you have retired from your home theater and drive your in-wall speakers with a full, rich stereo sound. Don?t make the mistake that others have by installing a common speaker selector when you really need a source selector. Unlike speaker selectors, the speaker level audio source selector features isolated connection for the positive and negative leads of both stereo channels, eliminating the chance of power feedback that can damage your amplifiers.