Electro-Voice CPS-2 120V Power Amplifiers Contractor Precision Series Amplifiers 170075BE Telex EV Electrovoice. 850 watts per channel at 2 ohms at 1 kHz: 1,700 watts per channel bridged at 4 ohms: Active-balanced XLR-type input and paralleled XLR-type output connectors provide easy signal routing: Rear-mounted dB-scaled detented level controls.