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Compact Digital Pre Amplifier Front View
Compact Digital Pre Amplifier Rear View
Example Diagram showing multiple devices connected to the amps & pre amps

KD-AMP220

Compact Digital Amplifier and Pre-Amp

  • Mixes microphone input with selected audio source and can provide phantom power to microphone

  • RS-232 controllable volume, muting, mic mix level and more

  • Pre-amp ideal for integrating into 70V audio systems with output reflecting volume, mixing and muting settings applied

  • 20 watts per channel at 4ohm, 40 watts at 8ohm bridged

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overview
resources
specS & accessories

introduction

The KD-AMP220 is a 2x20-watt Class-D amplifier with an 8 Ω 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

Additional Features

  • Control: Front panel, RS-232, IR with external IR Sensor (included)

  • Control System Support: Compass Control® Pro ready. Fully controllable by all IR, and RS-232 supported control systems via open API

  • Compact Size: 4.84”(W) x 3.42”(D) x 1.3”(H)

downloads

Hi-res Photo
Operation Manual
Application Example
IR Hex
Catalog Page

Diagrams

Daisy Chain Example
Conference Room Application
Training Room Application
Board Room Application
House of Worship Application
Conference Room Application
Lecture Hall Application
Classroom Application
Diagram

videos

Compact Digital Amplifier
KD- Compact Digital Audio Amplifier 220

specifications

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


accessories

  • Power Supply (qty 1) 24V/2.71A, 65W, desktop type, model KDSP60W12VC
  • Operating Instructions & Warranty card
  • 2 x L-type mounting ears 
  • IR Remote Contro
  • 2 x 3-pin, 1 x 4-pin, 2 x 6-pin Phoenix Connectors
  • IR Sensor

technical documents

Hi-res Photo
Operation Manual
Application Example
IR Hex
Catalog Page

videos

Compact Digital Amplifier
KD- Compact Digital Audio Amplifier 220

Images and Diagrams

Daisy Chain Example
Conference Room Application
Training Room Application
Board Room Application
House of Worship Application
Conference Room Application
Lecture Hall Application
Classroom Application
Diagram

specifications

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


accessories

  • Power Supply (qty 1) 24V/2.71A, 65W, desktop type, model KDSP60W12VC
  • Operating Instructions & Warranty card
  • 2 x L-type mounting ears 
  • IR Remote Contro
  • 2 x 3-pin, 1 x 4-pin, 2 x 6-pin Phoenix Connectors
  • IR Sensor
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