Rack mount Crown DC-300A Dual Channel Laboratory Power Amplifier. 

The DC-300-A is a dual-channel high-power amplifier for precision amplification of frequencies from DC to
20KHz. This unit features extremely low harmonic and intermodulation distortion, very low noise, highest
damping factor,” and quality parts and workmanship. Because of the large output power, it is possible to
obtain a monaural 70-volt balanced line without using an output transformer.

Output Power: 155 watts per channel. 
Load Impedance: Rated for 8 ohm usage; safely drives any load including completely reactive loads. 
Output Signal: Unbalanced, dual channel. 
Input Sensitivity: 1.75 volts +- 2% for 150 watts into 8 ohms.