Key Digital KD-AMP220 2-Channel 20-Watt Compact Digital Amplifier

I/O Connections: Analog Inputs: One (1) 6-pin Phoenix Connector; One (1) 3.5mm TRS Connector Microphone Input: One (1) 3-pin Phoenix Connector Control (Front Panel): Push Button, Rotary Knob Control (Rear Panel): RS-232 via One (1) 3-pin Phoenix Connector; IR via One (1) 3.5mm TRS Connector Microphone 48V Phantom Power Mode Switch: One (1) 2-Position Slide Switch Output Signal Format Selector: One (1) 3-Position Slide Switch Balanced/Unbalanced Analog Audio Output: One (1) 6-pin Phoenix Connector Speaker Output: One (1) 4-pin/5 mm Phoenix Connector 24V DC Power: One (1) Barrel (5.5 mm OD, 2.1 mm ID) Audio Performance: Input Impedance: >10kΩ Output Impedance: 50Ω Analog Output; 4/8Ω Speaker Output Maximum Rated Power Output: 40 Watts Frequency Response: 120 Hz to 20 kHz Common Mode Rejection Ratio (CMRR): >70 dB at 20 Hz to 20 kHz Signal to Noise Ratio (SNR): 80 dB (Max) Total Harmonic Distortion + Noise (THD+N)L: 1% at 1 kHz; 0.3% at 20 kHz at Nominal Leve Voltage Gain: 32 dB Chassis and Environmental: Enclosure: Painted Aluminum Dimensions (W x H x D): 8.661 x 1.299 x 4.094 (LxDxH) Net Weight: 1.153 Lb Operating Temperature: +32° to +104° F (0° to +40° C) Operating Humidity: 20% to 90%, Non-condensing Storage Temperature: +14° to +140° F (-10° to +60° C) Storage Humidity: 20% to 90%, Non-condensing Power, ESD, and Regulatory: Minimum Power Consumption: 5 watts Maximum Power Consumption: 45 watts Power Supply Input Voltage: 100-240v AC at 50/60 Hz at 0.5 A Power Supply Output Rating: 24V DC at 2.71 A ESD Protection: 15kV Device Regulatory: CE, FCC Power Supply Regulatory: CE, FCC