Leviton SGAMP System Matching Module (For Use with Non-Impedance Matched Volume Controls SGVST), White Mounts in Leviton's Structured Media Centers Connects six rooms/zones AutoSurge circuit technology provides an extra layer of system protection Transformer-Free impedance-matching design ensures linear frequency response, signal integrity and high power handling capacity Aerospace-grade Cermetile resistors replace conventional auto formers to maintain audio signal purity