Check the listing for details. Russound SDB4 4 Pair Speaker selector with volume control. Condition: New. Listed at 399.00 USD. Product highlightsplay up to 4 pairs of speakers simultaneously allows switching between two source amplifiers or receivers autoformers ensure efficient impedance matching each zone features independent volume, power, and source controls power handling: 200 watts per channel RMS accepts up to 14-gauge speaker wire includes room/speaker labels 17"W x 3-5/16"H x 7-1/2"D warranty: 10 years What's in the boxSDB-4.1 speaker selector for four pairs of speakers Sheet of self-adhesive room labels Installation Manual About this itemWritten by Crutchfield's Tara W.Here's a convenient way to distribute signals to four pairs of speakers from one location. The Russound SDB-4.1 lets you independently select and adjust the volume for each set of speakers - a necessity for most multi-room systems. This versatile design also allows you to switch between two source amplifiers or receivers. The impedance can be customized to match your specific combination of speakers and sources.