A professional 4-channel power amplifier in an compact 19" 1U metal case. Each channel can deliver 200 watts into 4 ohms. This amplifier can work in bridged and parallel modes. There is 120Hz high pass and low pass filter for connecting to satellite speakers or subwoofers. There is DC fault, high temperature, overload and short circuit protection. A plastic cover (included) can be installed to prevent access to the level knobs for use in installations. Connections are via balanced XLRs and speakon outputs.