Key Digital KD-AMP220 Manuel utilisateur

2 Channel 20 Watt Per Channel,

Compact Digital Audio Ampliﬁer

KD-AMP220

Operating Instructions

The Experts in Digital Video Technology and Solutions™

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

Introduction

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

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.

Application Examples

Basic

Advanced

Podium Laptop

Laptop

Ceiling Speakers

Display

Podium

Mic

VGA Laptop

VGA

L/R

HDMI

L/R

KD-MLV4x2Pro

Master Controller

IR/RS-232

RS-232

KD-MC1000

KD-X222PO

KD-AMP220

CAT5e/6

Video Conferencing

Ceiling Speakers

Camera

Mic

Apple TV

Music Streamer

Podium Laptop

Laptop

Ceiling Speakers

Display

Podium

Mic

VGA Laptop

VGA

L/R

HDMI

L/R

KD-MLV4x2Pro

Master Controller

IR/RS-232

RS-232

KD-MC1000

KD-X222PO

KD-AMP220

CAT5e/6

Video Conferencing

Ceiling Speakers

Camera

Mic

Apple TV

Music Streamer

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 -

›6. Speaker Output

Speaker Mode Pin 1 Pin 2 Pin 3 Pin 4

STEREO Left Channel+ Left Channel- Right Channel+ Right Channel-

MONO Mono+ Mono- Mono+ Mono-

BRIDGE Mono+ N/C N/C Mono-

›7. Speaker Output Mode Selector

»a. STEREO: 2 channels 20W@4ohm speakers

»b. MONO: 2 x mono 20W@4ohm speakers (stereo to mono conversion)

»c. BRIDGE: Single 40W@8ohm speaker (stereo to mono conversion)

Unit Control & Power

›8. IR Sensor Input

»a. Tip: IR Sensor (5V) Power

»b. Ring: IR Signal

»c. Sleeve: Ground

›9. RS-232

»a. Pin 1: TxD

»b. Pin 2: Ground

»c. Pin 3: RxD

›10. 24V DC Power Input

Front Panel

1 2 3 4 5

Input Connections and Selector

›1. Input Source select button and LEDs

›2. Control Button and LEDs

»a. Used to select Volume or EQ control of Mic or Line inputs

»i. Mic for volume control of MIC input

»ii. Line for volume control of LINE (inputs 1 or 2)

»iii. Bass for bass level control of LINE (inputs 1 or 2)

»iv. Treble for treble level control of LINE (inputs 1 or 2)

›3. Volume Control Knob

»a. Controls level of Mic, Line, Bass, and Treble

»i. Bass and Treble settings apply only to Line level input

»b. Push to mute/un-mute respective control selection

»i. Mutes/un-mutes Mic input, if Mic is selected

»ii. Mutes/un-mutes Line input, if Line is selected

»iii. Mutes/un-mutes both Mic and Line inputs, if Bass or Treble are selected

»Note: Volume adjustments do not affect muting status. If volume is adjusted to a muted

source, it will remain muted.

›4. MUTE LED

»a. Illuminated if selected control position is muted/un-muted

›5. USB Service port

»a. Firmware update should only be applied if advised by Key Digital’s Technical Support

team.

›Factory Default via front panel: To factory default unit, press & hold Input + Control buttons

simultaneously for 10 seconds

Speaker Wiring

L/R Stereo

4ΩLoad with 4ΩSpeakers:

L/R Stereo with Parallel Speakers

4ΩLoad with 10W 8ΩSpeakers:

Bridged Audio Option

8ΩLoad with 8ΩSpeakers:

IR Remote Control

IR Control must be achieved via included IR sensor only.

There is no built-in IR sensor

›INPUT SEL: Direct selection of input 1 or input 2

›MUTE: Direct muting of MIC or LINE inputs. The SPEAKER

button unmutes all sources

›VOLUME CONTROL: Direct volume and level controls for

Mic, Line, Bass, and Treble.

›Note: IR Control must be achieved via included IR sensor

only. There is no built-in IR sensor.

RS-232 Control

KD-AMP220 gives access to all software functions when used controlled by RS-232

›

RS-232 cable pinout

Master Controller KD-AMP220

Tx Rx

Rx Tx

Ground Ground

Baud Rate = 9600 bits per second

›Data Bits = 8

›Stop Bits = 1

›Parity = None

›Flow Control = None

›Carriage Return: Required

›Line Feed: Required

›Commands are not case-sensitive.

Spaces shown below may be excluded.

›Carriage return and line feed is required at the end of each string.

Input Switching

Description Command Command Example and Response

Switch to Audio Input1 SPO01SA01 SPO01SA01

Output Audio switch to Input 01

Switch to Audio Input2 SPO01SA02 SPO01SA02

Output Audio switch to Input 02

Switch to Audio Input1

*Redundant Command SPO01SI01 SPO01SA01

Output Audio switch to Input 01

Switch to Audio Input2

*Redundant Command SPO01SI02 SPO01SA02

Output Audio switch to Input 02

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