Russound SDB6.1 Speaker Selector Dual Amplifier Inputs Allow A Choice Of Program In Each Room Printed Room Labels Included Detachable Snap Connectors Are Color Coded For Easy Wire Termination Selectable Impedance Matching Accommodates 4- Or 8-Ohm Speakers High-Quality Autoformers Provide Trouble-Free Performance For Years Efficient multi-room speaker selector accommodates up to 6 speaker pairs Dual source (amp) inputs let you listen to jazz on some speakers and classical on the others Individual A/B input selectors, volume controls, and on/off switches for each speaker set Auto-grade, impedance-matching autoformers maintain a safe load while distributing max power Designed for 4- or 8-ohm speakers; 17 by 3 by 6.25 inches (W x H x D); 10-year warranty