The versatile AB-2.2 selector switch allows you to power a single pair of speakers with either of two amplifiers or power either of two speaker pairs with a single amplifier. Easy to install and simple to use, it's ideal for situations where you need a local source, such as stereo receiver, to share a pair of room speakers with your whole-house audio system. The AB-2.2 sits conveniently on a shelf or tabletop near your audio equipment.