Volume controls are a great way to control one or many speakers from one location. This impedance matching volume control supports up to 100 watts per channel. Impendence matching volume controls ensure that the impedance load shown to the receiver or amplifier never goes below the rated capabilities. This volume control will support up to 14 gauge wire. Impendence matching volume controls are typically used with 3 or more speaker, or where impedance matching is required. This volume control can support up to 16 pairs of speakers. Included with is volume control is a weather-resistant box for outdoor installations.