Russound EZB-1SC Modular Speaker Connecting Block. Provides a single 4 conductor stereo amplifier input to 4 speaker pair outputs. Must use with impedance matching volume controls. 300Watt peak power handling,150 Watt RMS continuous. Have screwless removable snap connectors that accept up to 14-gauge wire. Has an expansion connector for a Russound EZB-2SC to allow up to 16 speaker pairs.