Connect and safely control multiple speaker pairs with a single amplifier. Automatic impedance protection circuitry. 100 watts RMS per channel power capacity. 4.6-ohm minimum amplifier impedance with six 4-ohm speakers selected, 5.3-ohm minimum with 8-ohm speakers. Supports 12-16 AWG speaker wire. Individual zone on/off buttons. Heavy-duty screw-type connectors.