Key Digital KD-AMP220 Operating Instructions Manual
2 Channel 20 Watt Per Channel,
Compact Digital Audio Amplifier
KD-AMP220
Operating Instructions
The Experts in Digital Video Technology and Solutions
™
4
Always follow the instructions provided in this Operating Manual.
Table of Contents
Introduction ................................................................ 1
Quick Setup Guide .......................................................... 2
Application Examples ........................................................ 3
Connections, Buttons and LEDs ................................................ 4
Speaker Wiring ............................................................. 7
IR Remote Control........................................................... 8
RS-232 Control ............................................................. 8
Specifications ............................................................. 12
Important Product Warnings & Safety Instructions: ................................. 14
FCC Statement ............................................................ 14
How to Contact Key Digital
®
.................................................. 15
Warranty Information ........................................................ 15
1
Introduction
The KD-AMP220 is a 2x20 watt Class-D amplifier with 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.
Key Features
› Class D Amplification: 40-Watt @ 8ohm / 20-Watt @ 4ohm
› Mixing: Output is a mix of microphone and the selected audio input
› Signal Processing:
» 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
› Control: Front panel, RS-232, IR with external IR Sensor (included)
› Compact Size: 4.84”(W) x 3.42”(D) x 1.3”(H)
Accessories
› Operating Instructions & Warranty card
› 2 x L-type mounting ears
› IR Remote Control
› 2 x 3-pin, 1 x 4-pin, 2 x 6-pin Phoenix Connectors
› Power Supply: 24V/2.71A (65W), screw-in type
› IR Sensor
2
Quick Setup Guide
1. Begin with the KD-AMP220 unit and all input/output devices turned off
and power cables removed.
2. Connect audio output of source devices to the desired input of KD-AMP220
using high-quality audio cables.
3. Connect a microphone to the microphone input connector.
4. Set 48V phantom power mode switch as needed:
» a) ON for Condenser microphones
» b) OFF for Dynamic microphones
5. Adjust the speaker output mode selector based on the desired output mode
of the KD-AMP220.
» a) STEREO – Stereo audio signals will maintain stereo audio on the outputs;
20 watts per output.
» b) MONO – Stereo audio signals will be summed to dual mono signals on the outputs;
20 watts per output.
» c) BRIDGE – Stereo audio signals will be summed to a single, high output audio output;
40 watts total output.
6. Connect speakers in accordance with above desired output mode.
Use high quality speaker wire. See Speaker Wiring section for more information
7. For IR control, plug the IR receiver into the IR Sensor port. IR receiver should be
mounted in line-of-sight location.
8. For RS-232 control, connect the master controller / control processor / control PC
to the RS-232 port.
9. Connect power to the KD-AMP220.
10. Connect power to input and output devices. Power on attached audio devices.
3
Application Examples
Basic
Advanced
Podium Laptop
Ceiling Speakers
Display
Podium
Mic
VGA Laptop
VGA
L/R
HDMI
HDMI
HDMI
HDMI
L/R
L/R
KD-MLV4x2Pro
Master Controller
IR/RS-232
RS-232
KD-MC1000
KD-X222PO
KD-AMP220
CAT5e/6
Video Conferencing
Camera
Mic
Apple TV
Laptop
KD-AMP220
Ceiling Speakers
Mic
Music Streamer
4
Connections, Buttons and LEDs
Rear Panel
1 2 3 4 5 6 7 8 9 10
Input Connections and Selector
› 1. Microphone Input and 48V Phantom Power Mode Switch
» a. Pin 1: +
» b. Pin 2: Ground
» c. Pin 3: -
› 2. Phantom (48V) slide switch
» a. ON: Condenser microphones
» b. OFF: Dynamic microphones
› 3. Balanced/Unbalanced Analog Input 1
» a. Pin 1: Left +
» b. Pin 2: Left Ground
» c. Pin 3: Left -
» d. Pin 4: Right +
» e. Pin 5: Right Ground
» f. Pin 6: Right -
› 4. L/R Analog 3.5mm stereo Input 2
» a. Tip: Left
» b. Ring: Right
» c. Sleeve: Ground
Output Connections and Selector
› 5. Balanced/Unbalanced Analog Audio Output
» a. Pin 1: Left +
» b. Pin 2: Left Ground
» c. Pin 3: Left -
» d. Pin 4: Right +
» e. Pin 5: Right Ground
» f. Pin 6: Right -
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