The Chandler Limited RS660 Compressor builds upon the technological advancements that began with the historic EMI RS124 and Fairchild 660 compressors used at EMIs Abbey Road Studios during the 1960s, and distills them into a refined and elegant compression circuitthat is the RS660 Compressor. Rather than a reproduction of existing equipment, the RS660 Compressor stands apart and represents a path forward in the recording engineering development department. Built around the 6386 vacuum tube, the RS660 Compressor is meticulously tuned for a sound, and the result is a more efficient means to achieve the desired characteristics of the historic 660 and beyond.Specifications:Channels: MonoType: Valve 6383, 6CG7, 6AL5I/O: XLR, Transformer BalancedOutput Impedance: Selectable, 200/600 Input/Output Control: Continuous (Stepped Optional)Time Constant: 7 Positions, SteppedModes: THD, Comp, LimitStereo Link: Switchable, 1/4″ JackPower: Internal, Wired for Region 110-120V/220-240V