This super sturdy, easy to install outdoor volume control can be used for one pair (two speakers). A pure resonance resistor-based volume control, it can handle up to 300 watts of optimal sound with minimal bass roll-off. The control board is prewired and the wires are clearly labeled, making installation easy, and this product can take the rigors of outdoor environments. You can use these along with one of our speaker selectors for a whole-house audio system at an affordable price.