Rockville RPA60BT V2 1000 Watt 2-Ch USB Bluetooth DJ/Pro/Karaoke Amplifier Mixer. 19 rack mountable (removable rack brackets) digital hybrid amplifier/receiver. THD: > 0.1%. Input Sensitivity: 400mv/33 KOhm. Frequency Response: 20 Hz – 20 kHz. Signal to Noise Ratio: 80 dB. Front Inputs: 3.5MM front aux input, 1/4? Headphone Jack, (2) 1/4 Mic Inputs, USB Input, Optical. Rear Inputs: RCA, Optical, Coaxial. Rear Outputs: Preamp output for an external additional amplifier or powered speaker. Sub preamp output to connect a powered subwoofer or an amplifier. Record output to mixer.