Audio international AI-DEQ-01 User manual

7300 Industry Drive, North Little Rock, AR 72117
Phone: [phone] Fax: [phone]
www.audiointl.com
Installation Manual
Model #: AI-DEQ-01
Digital Equalizer / Audio Processor
Document #540023

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 2 of 10
Document Revision History
Rev. Level Date Description
IR 11/1997 Initial Release
A 4/2000 ECN # 4889
Reference Documents
Document # Drawing # Description
N/A 5215761 AI-DEQ-01 Outline Drawing
Service Bulletin List
Service
Bulletin # Subject Manual Revision Revision Date
Table of Illustrations
Illustration # Description Page #
1 Block Diagram – Typical Application 5
2 Reference Drawings 10
PROPRIETARY NOTICE: Despite any other copyright notice, this document and information disclosed
herein contains confidential, proprietary designs owned by Audio International, Inc. Neither this
document nor the data contained herein shall be reproduced, used or disclosed to anyone without the
written authorization of Audio International, Inc.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 3 of 10
Table of Contents
Section Description Page
1.0 General Information ……………………………………………. 4
1.1 Introduction ……………………………………………………….. 4
1.2 Purpose of the Equipment ………………………………………. 4
1.3 Operational Features …………………………………………….. 4
1.4 Optional Equipment ……………………………………………… 4
2.0 Application ……………………………………………………….. 5
2.1 Introduction ……………………………………………………….. 5
2.2 Block Diagram –Typical Application …………………………… 5
3.0 Installation ……………………………………………………….. 5
3.1 Prior to Installation ……………………………………………….. 5
3.2 Unpacking and Inspection ………………………………………. 6
3.3 Cautions & Warnings …………………………………………….. 6
3.4 Wiring Requirements …………………………………………….. 6
3.5 Physical Characteristics………………………………………….. 7
3.6 Electrical Characteristics…………………………………………. 8
3.7 Mating Connector Information ……………..……………………. 8
3.8 Pinout Assignment Descriptions ………………………………... 8
3.9 Post-Installation Test …………………………………………….. 8
4.0 Troubleshooting Guide………………………………………… 9
4.1 General Troubleshooting Procedures………………………….. 9
4.2 Troubleshooting Guide…………………………………………… 9
5.0 Specifications …………………………………………………… 10
6.0 Reference Drawings ……………………………………………. 10

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 4 of 10
MODEL # AI-DEQ-01
Digital Equalizer / Audio Processor
1.0 General Information
1.1 Introduction
This manual contains information for the proper installation of the Audio
International, Inc. (AI) Digital Equalizer / Audio Processor, Model Number
AI-DEQ-01. Included are physical and electrical characteristics and
additional references needed for operation of the unit.
1.2 Purpose of the Equipment
The AI-DEQ-01 is a professional digital equalizer / audio processor that
has an image “inhancer”for quality surround effect. The equalizer
provides the passengers the ability to select up to eight (8) programmed
music styles. The unit is built to rugged aircraft standards and is easily
incorporated into new or existing cabin audio systems.
1.3 Operational Features
Listed below are key features of the AI-DEQ-01:
q Ten different band frequencies at one-octave intervals
q Solid state circuitry
q AI’s proprietary RS-485 Data Bus interface
q Up to four units can be connected to the data bus
q Lightweight, compact
q Specially designed to meet aircraft standards
1.4 Optional Equipment
Audio International, Inc. offers a comprehensive family of cabin
accessories to enhance aircraft systems. As an industry leader in aircraft
cabin systems, Audio International, Inc. can offer the perfect combination
for the aircraft cabin.
Contact your AI representative for details.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 5 of 10
2.0 Application
2.1 Introduction
The purpose of the audio equalizer is to compensate for the frequencies
that might be absorbed by the aircraft interior. The equalizer adjustments
are most effective when made after the aircraft interior is thoroughly
furnished and all pieces of furniture are in place.
Also, the audio equalizer tunes to the preferred music style. Through
passenger controls, the AI-DEQ-01 will select the programmed music
style.
2.2 Block Diagram –Typical Application
3.0 Installation
3.1 Prior to Installation
Prior to installation, the following items should be considered:
3.1.1 During the design and layout of the aircraft cabin, careful
consideration of the location of this module is necessary. Some of
the items to be considered include:
• Space
• Available power supply
• Environmental conditions (temperature, humidity, etc.)
• Length of cable runs
3.1.2 The AI-DEQ-01 shall be installed to conform to the standards
designated by the customer, installing agency, and existing
conditions as to the unit location and type of installation.
3.1.3 Mounting screws are required to secure the unit. Refer to Section
7.0, Reference Drawings, for mounting hole diameters and
configuration.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 6 of 10
3.2 Unpacking and Inspection
Carefully open the packaging and remove the unit. Verify that all
components have been included in the package per the packing list.
Inspect the unit for damage. Retain the packing materials and packing
list.
If damage has occurred during shipping, a claim must be filed with AI
within 24 hours and a “Return Request Authorization Number”must be
obtained from AI. Refer to the front cover of this manual for address and
telephone number of Audio International. Repackage the unit in its
original packaging materials and return it to AI following instructions given
by the AI representative. If no return is necessary, retain the packing
materials for storage or reshipment if necessary.
3.3 Cautions and Warnings
3.3.1 It is important to do a pin-to-pin power and ground check on all
connectors. Ensure that power and ground are applied only where
specified. Damage to the unit may result if power or ground is
applied to the wrong points.
3.3.2 DO NOT connect or disconnect the module while power is applied.
3.3.3 DO NOT remove any factory-installed screws. Damage to the units
may result and void any warranties.
3.4 Wiring Requirements
3.4.1 Introduction
The installing agency shall supply and fabricate all external cables
and mating connectors. The length and routing of external cables
must be carefully studied and planned before attempting installation
of the equipment. Allow adequate space for installation of cable
and connectors. Avoid sharp bends and placing cables near
aircraft control cables. Maintain a minimum clearance of three (3)
inches from any control cable. If wiring is run parallel to
combustible fluid or oxygen lines, maintain a separation of six (6)
inches between the lines.
3.4.2 Power Wires
All power and ground wires shall be 22 AWG, minimum. Power
ground wires shall be grounded within twelve (12) inches of the
unit. All wires shall be in accordance with MIL-W-22759 or
equivalent. Protect power wires with circuit breakers or fuses
located close to the electrical power source bus.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 7 of 10
3.4.3 Audio Lines
All audio input cables shall be 22 AWG twisted shielded pair unless
otherwise specified. Audio output cables must be 18 AWG
minimum, 16 AWG preferred. All audio input and output lines
require twisted shielded cable with the cable shields grounded at
the source.
3.4.4 Data Bus Lines
The AI-DEQ-01 is designed to interface with other Audio
International equipment via AI’s proprietary RS-485 serial data bus.
The data bus is to be implemented using a twisted shielded pair
cable in accordance with MIL-DTL-27500 or equivalent. The wire
size for the conductors in this cable is to be 22 AWG, minimum.
The shield is to be connected everywhere a shield pin is provided.
Shield terminations are to be made as close to the connector pin as
possible. In the event shield pins are not provided, the data bus
shield must be terminated per AI’s RS-485 specification. All
equipment on the RS-485 data bus shall be connected in a “daisy-
chain”configuration.
AI’s proprietary RS-485 serial data bus specification is available
upon request.
3.5 Physical Characteristics
3.5.1 Refer to Section 6.0 for unit dimensions.
3.5.2 Refer to Section 7.0 for attachment points.
3.5.3 When mounting the unit, allow sufficient space for mating
connectors.
3.6 Electrical Characteristics
3.6.1 Refer to Section 6.0 for electrical specifications.
3.6.2 One 25-pin connector is located on the unit. This connector
provides +28 VDC power, audio connections, ground, data bus
signals, and ID strapping pins.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 8 of 10
3.4.5 Device ID Pins
Device ID pins (Pins 14 –17) are used to provide a unique address
on the RS-485 data bus. The ID pins will allow up to four modules
to be installed on the aircraft RS-485 data bus. Since the first ID
number is 0, device ID pin connections are not required when only
one unit is used. If more than one unit is configured on the data
bus, connect the respective device ID pins to ID common.
3.7 Mating Connector Information
All wiring harnesses to the unit are supplied and fabricated by the
installing agency. The unit utilizes a DBMA-25P unit connector, a
DBMA-25S mating connector, and a D20418-2 male screw lock.
3.8 Pinout Assignment Descriptions
Pin # Description
1 +28 VDC Power
2 Ground
3 R+ Audio Input
4 R- Audio Input
5 L+ Audio Input
6 L- Audio Input
7 R+ Audio Output
8 R- Audio Output
9 L+ Audio Output
10 L- Audio Output
11 Data Bus (A)
12 Data Bus (B)
13 Data Bus Shield
14 Unit ID 1
15 Unit ID 2
16 Unit ID 3
17 Unit ID Common
18 Reserved
19 Reserved
20 Reserved
21 Reserved
22 Reserved
23 Reserved
24 Reserved
25 Reserved
3.9 Post-Installation Test
Load the audio source with selected material. Any unit that relays audio
outputs through the unit may be used to test proper operation. With the
aircraft and audio power “ON”, apply power to the unit.
Verify that audio input is available to the system. Verify that the selected
material may be heard.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 9 of 10
4.0 Troubleshooting Guide
4.1 General Troubleshooting Procedures
Many problems can be isolated with the following general techniques:
• To verify power to the unit, recheck +28 VDC is applied to the proper
pins on the unit. Use a voltmeter to verify correct level.
• Reset by removing power from the unit for at least one minute and
reapply power. Verify the problem still exists.
• Recheck all connections to the unit for security. Check all harness
runs for possible pinching. Recheck all pinouts for application
accuracy.
4.2 Troubleshooting Guide
Problem Possible Cause Solution
No sound in
speakers Power amplifier may not be functioning or
improperly installed
Unit is improperly
installed.
No audio material in
source unit.
Verify +28 VDC power
and audio input is
present.
Verify +28 VDC power
and audio input is
present.
Insert audio material in
source unit.
Poor audio quality Audio controls are not
adjusted properly.
Improper shield
terminations.
Adjust audio controls.
Verify all shield
terminations.
Should difficulties arise in the installation of the unit, contact Audio International,
Inc. product support.

Audio International, Inc. AI-DEQ-01Installation
Document #540023, Rev. A, 4/2000 Page 10 of 10
5.0 Specifications
Unit Specifications
Physical Specifications
Housing Aluminum
Dimensions
(L x W x H) 5.00”x 5.00”x 1.00” 12.70cm x 12.70cm x 2.54cm
Weight 0.53 lbs. / 0.24 kg
Electrical Specifications
Power 150 mA @ +28 VDC
Output Level Adjustments 0 through 50 dB
Frequency Bands 31, 62, 125, 250, 500, 1K, 2K, 4K, 8K, 16K
Data Bus Type AI Proprietary RS-485
6.0 Reference Drawings
The following diagrams show the unit dimensions and connector locations for the
AI-DEQ-01. All dimensions are shown in inches.