Key Digital KD-AMP220 Compact Digital Amplifier and Pre-Amplifier

The KD-AMP220 is a 2×20-watt Class-D amplifier with an 8 speaker output ideal for installation in presentation spaces. Input connections accommodate microphone, line level balanced/unbalanced, and line level 3.5mm stereo analog audio inputs. The output is a mix of audio from the microphone input and the selected audio input. Microphone and output volume levels may be variably controlled via IR, RS-232, or the front panel, and speaker level output may be set to bridge stereo or mono mode.

Features

• Class D 2 Channel Amplification: 20W PER CHANNEL @ 4ohm, 40W @ 8ohm BRIDGED
• Mixing: Output is a mix of microphone and the selected audio input
• Signal Processing of variable volume level set for each input. Variable volume, bass, and treble for output
• Inputs: Microphone (3-pin balanced, condenser/dynamic), 6-pin balanced stereo, 3.5mm stereo
• Phantom Power: 48V phantom power for integration with condenser microphones
• Outputs: Pre-amp line level (6-pin balanced), speaker level
• Speaker Level Output: Bridge, stereo, or mono modes selectable
• Noise gate for consistent audio levels, prevention of ambient noise

Specifications

• 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:>10k
• Output Impedance:50 Analog Output; 4/8 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