LA Audio PRO Series User manual

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PRO SERIES
DA82
AUDIO DISTRIBUTION AMPLIFIER

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CONTENTS
1. INTRODUCTION Page 3
2. TECHNICAL SPECIFICATIONS Page 4
3. INSTALLATION Page 5
3.1 Inspection & Unpacking Page 5
3.2 Operating Environment Page 5
3.3 Power requirements & Line Voltage switch Page 6
4. DESCRIPTION OF CONTROLS Page 8

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1.INTRODUCTION
The DA82 is a compact distribution amplifier, configurable for mono (1x8) or stereo
(2x4) operation.
Each input and output is switchable between calibrated and uncalibrated mode,
allowing instant adjustment of input sensitivity or output level. All inputs and outputs
are electronically balanced on XLR's.
The DA82 is ideal for O.B. vans, sound reinforcement systems, theatres and any
application where its ease of installation and set-up will be greatly appreciated.
The DA82 is buit in accordance with EMC and safety regulations encompassed by
the «CE» marking guaranteeing trouble free integration in systems.

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2. TECHNICAL SPECIFICATIONS
ELECTRICAL
Input Impedance 20kOm balanced
Maximum Input Level +20dBu
Input Gain adjustable -12 to +12dB
Output Impedance 75Om balanced
Recommended Output Load 600Om to infinity
Maximum Output Level +20dBu
Output Gain adjustable -12 to +12dB
Frequency Response
20Hz to 20kHz +0, -0.5dB
Total Harmonic Distortion (THD)
1kHz,+4dBu 0.05%
Noise -98dBu (unweighted 22 Hz - 22kHz)
PHYSICAL
Input Connectors XLR 3 pin Female, Pin 2 Hot
Output Connectors XLR 3 pin Male, Pin 2 Hot
Size 482mm W x164mm D x 44 mm H
19'W x 6.45'D x 1.75'H
Weight 2.9 kg, 6 Ibs
Shipping Weight 3.6 kg, 8 Ibs
Temperature Range
Operating 0°Cto+50°C
Storage -30°Cto+75°C
Finish Light Grey Epoxy

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3. INSTALLATION
IT IS IMPORTANT TO READ THIS SECTION BEFORE USING THE UNIT.
3.1. INSPECTION & UNPACKING
The model DA82 is carefully packed at the factory and the container designed to
withstand handling in transit.
However, if transit damage is evident, DO NOT discard any of the packaging material
and notify the carrier immediately, as it is he who is responsible for such claims.
The shipment should contain the following :
•The unit DA82
•Power cord
•Operation Manual (this book)
If any of the above items are missing, notify your supplier immediately, and DO NOT
discard any of the packaging materials.
The power cable may be supplied without a connector at the supply end. This is
because there is no world-wide standard, and therefore the user should supply a
mains connector for use with the unit.
3.2. OPERATING ENVIRONMENT
The unit is designed to operate between 0 and +50 degrees Celcius (32 - 122° F)
and in an atmosphere of relative humidity up to 80%.
Should the unit be installed in an equipment rack, it is important to ensure that the
operating temperature inside the rack does not exceed the upper limit. This may
often be the case where the rack contains power amplifiers and a cooling fan may be
necessary in such installations.

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Although designed to withstand hum pick-up, and it is VERY important that the unit is
not installed close to any electro-magnetic fields which may be generated from power
transformers or motors.

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3. INSTALLATION
3.3.POWER REQUIREMENTS & LINE VOLTAGE SWITCH
The voltage Is normally pre-selected at the factory for the country of destination, and
a sticker will indicate the voltage the unit Is set for.
3 versions exist :
•230V
•110-125V
•100V
IF IN DOUBT CHECK THE TRANSFORMER TYPE INSIDE THE UNIT AND
ENSURE THAT THE CORRECT FUSE IS USED ( 0.1 amp fast for 200-250 & 0.2
amp Slow blow for 100-125 ).

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4. DESCRIPTION OF CONTROLS
FRONT PANEL
1) CAL/UNCAL switch :In CALibrated mode, the input section gain is unity at 0dB.
However, this may be adjusted via trimmer (2). In UNCALibrated mode, the input
gain is controlled by potentiometer (3).
2) Input gain trimmer :this screwdriver adjustement trimmer allows +\-6dB gain in
CALibrated mode.
3) Input gain potentiometer :this potentiometer allows .±6dB gain in UNCALibrated
mode.
4) MONO/STEREO switch :in Stereo mode, input A is distributed to odd numbered
outputs, input B to even numbered outputs. In Mono mode, input A is distributed to all
outputs, input B is not used.
5) CAL/UNCAL switch : In CALibrated mode, the output section gain is unity at 0dB.
However, this may be adjusted via trimmer (6). In UNCALibrated mode, the output
gain is controlled by potentiomer (7).
6) Output gain trimmer : this screwdriver adjustement trimmer allows .±6dB gain in
CALibrated mode.
7) Output gain potentiometer : this potentiometer allows +\-6dB gain in
UNCALibrated mode.
8) Power ON Led : this led is illuminated as soon as the unit is connected to the
mains. The DA82 is designed to operate continously so it has no mains switch.

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4. DESCRIPTION OF CONTROLS
REAR PANEL
Inputs are electronically balanced on XLR connectors. Wiring is as follows :
Pin 1 Shield
Pin 2 Hot
Pin 3 Cold
If the input source is unbalanced, Pin 3 should be connected to Pin 1. However, it is
preferrable to use a balanced cable with Pin 3 and Pin 1 tied together at the source,
not at the input of the DA82.
Outputs are electronically balanced on XLR connectors. Wiring is as follows :
Pin 1 Shield
Pin 2 Hot
Pin 3 Cold
If the output connection is unbalanced. Pin 3 should be connected to Pin 1. However,
it is preferrable to use a balanced cable with Pin 3 and Pin 1 tied together at the input
of the equipement receiving signal from the DA82.
The mains receptacle is at the EEC standard with the center prong connected to the
ground.
For obvious satefy reasons, it should always be connected.
The DA82 can be operated continously ; thus it does not have a mains switch.
The mains fuse must be replaced only with the same type and value.

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230Vac 100mA T
100-125Vac 200mA T