TOA's E-03R is a controller module for the F-121C/121CM to be used in conjunction with the TOA 900 series modular mixers and amplifiers. Power Source: 24 VDC; Current Consumption: Less than 25 mA; Distortion: Less than 0.05 %; Input:1 V, 100 k, RCA pin jack; Output: 1 V, 1 k, RCA pin jack