RSVC4 is a beautifully designed four-zone speaker selector with volume controls that allows you to run four sets of speakers to multiple zones, control the volume of each zone separately and protect your amplifier from dangerous overload. This multi-zone speaker selector allows you to connect different loudspeakers to one amplifier without risk of overloading because the RSVC4 resolves the impedance problem inherent with running multiple speakers off of a single amp and has the added benefit of volume control for each pair of speakers. Ideal for restaurants, hotels or retail settings where you may want a higher volume in one area but a low, mellow tone others, the RSVC4 can also be switched on or off with the front-mounted on/off button buttons. This speaker selector with volume control is ideal for a wide range of distributed audio systems and includes features found on selectors that cost three times more. Made of high-quality metal cast construction and compact enough to fit tablet top, connect four pairs of speakers or eight speakers total and enjoy total control of your audio with just a push of a button.