2 Channel 4500 Watts Professional DJ PA Power Amplifier 2U Rack mount SYS-4500 MUSYSIC ATR (Accelerated Transient Response) technology for ultimate punch and clarity 4500 watts of Instant Peak Power (750 watts RMS) XLR,  (6.5mm Jack) Balanced Inputs Speakon and Banana binding post Outputs Front-to-Rear Airflow and Dual Cooling Fans