AUDAC EPA252 User manual

EPA152/252/502
User Manual
www.audac.eu

2
ADDITIONAL INFORMATION
This manual is put together with much care, and is as complete as could be on the
publication date. However, updates on the specifications, functionality or software may
have occurred since publication. To obtain the latest version of both manual and software,
please visit the Audac website @ www.audac.eu.

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Index
Introduction 5
Precautions 6
Safety requirements 6
Caution servicing 6
EC Declaration of Conformity 6
Waste of Electrical and Electronic Equipment (WEEE) 7
Caution 7
Chapter 1: Pin connections and connectors 9
Connection standards 9
Chapter 2: Front & rear panel 10
Front panel overview 10
Front panel description 10
Rear panel overview 11
Rear panel description 11
Chapter 3: Connecting the amplifier 12
Input connections 12
Output connections 12
Connection modes 13
Chapter 4: Additional information 14
Technical specifications 14
Notes 16

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5
Introduction
Dual channel Class-D amplifiers
The EPA series are energy efficient Class-D power amplifiers designed for a wide variation of
applications, ranging from standard stereo configurations to multi-zone distributed speaker
systems. They come available in various models with different output configuration and
power ratings.
An outstanding sound quality is combined with other known advantages of Class-D amplifiers
such as high energy efficiency. Automatic signal detection switches the amplifier to standby
mode when no input signal is detected. This makes the amplifier comply to international
energy and environmental requirement standards.
The compact size and lightweight design only requires a single 19” rackspace, while making
them suitable for both fixed rack and mobile applications. The convection cooled construction
requires only a minimum maintenance while guaranteeing high reliability.
The dual channel models of the EPA series are containing two individually controllable
channels with the possibility for bridging the outputs, merging their power to a single load.
They are featuring advanced protection circuitry which protects against DC malfunctioning,
short circuit, overheating and overload.
The signal input connections are implemented using balanced XLR connectors with link output
connectors, allowing linkthrough to other amplifiers. Loudspeaker outputs are connected
using both Speakon compatible and terminal block output connectors.

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Precautions
READ FOLLOWING INSTRUCTIONS FOR YOUR OWN SAFETY
ALWAYS KEEP THESE INSTRUCTIONS. NEVER THROW THEM AWAY
ALWAYS HANDLE THIS UNIT WITH CARE
HEED ALL WARNINGS
FOLLOW ALL INSTRUCTIONS
NEVER EXPOSE THIS EQUIPMENT TO RAIN, MOISTURE, ANY DRIPPING OR SPLASHING
LIQUID. AND NEVER PLACE AN OBJECT FILLED WITH LIQUID ON TOP OF THIS DEVICE.
DO NOT PLACE THIS UNIT IN AN ENCLOSED ENVIRONMENT SUCH AS A BOOKSHELF
OR CLOSET. ENSURE THERE IS ADEQUATE VENTILATION TO COOL THE UNIT. DO NOT
BLOCK THE VENTILATION OPENINGS.
DO NOT STICK ANY OBJECTS THROUGH THE VENTILATION OPENINGS.
DO NOT INSTALL THIS UNIT NEAR ANY HEAT SOURCES SUCH AS RADIATORS OR
OTHER APPARATUS THAT PRODUCE HEAT
DO NOT PLACE THIS UNIT IN ENVIRONMENTS WHICH CONTAIN HIGH LEVELS OF DUST,
HEAT, MOISTURE OR VIBRATION
THIS UNIT IS DEVELOPED FOR INDOOR USE ONLY. DO NOT USE IT OUTDOORS
PLACE THE UNIT ON A STABLE BASE OR MOUNT IT IN A STABLE RACK
ONLY USE ATTACHMENTS & ACCESSORIES SPECIFIED BY THE MANUFACTURER
UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG
PERIODS OF TIME
ONLY CONNECT THIS UNIT TO A MAINS SOCKET OUTLET WITH PROTECTIVE
EARTHING CONNECTION
THE MAINS PLUG OR APPLIANCE COUPLER IS USED AS THE DISCONNECT DEVICE, SO
THE DISCONNECT DEVICE SHALL BE READILY OPERABLE
EC DECLARATION OF CONFORMITY
This product conforms to all the essential requirements and further
relevant specifications described in following directives: 2014/30/EU
(EMC) and 2014/35/EU (LVD)
CAUTION - SERVICING
This product contains no user serviceable parts. Refer all servicing to
qualified service personnel. Do not perform any servicing (unless you
are qualified to)

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CAUTION
The symbols shown are internationally recognized symbols that warn about potentional
hazards of electrical products. The lightning flash with arrowpoint in an equilateral triangle
means that the unit contains dangerous voltages. The exclamation point in an equilateral
triangle indicates that it is necessary for the user to refer to the users manual.
These symbols warn that there are no user serviceable parts inside the unit. Do not open the
unit. Do not attempt to service the unit yourself. Refer all servicing to qualified personnel.
Opening the chassis for any reason will void the manufacturer’s warranty. Do not get the
unit wet. If liquid is spilled on the unit, shut it off immediately and take it to a dealer for
service. Disconnect the unit during storms to prevent damage.
WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
The WEEE marking indicates that this product should not be disposed
with regular houshold waste at the end of its life cycle. This regulation
is created to prevent any possible harm to the environment or human
health.
This product is developed and manufactured with high quality materials
and components which can be recycled and/or reused. Please
dispose this product at your local collection point or recycling centre
for electrical and electronic waste. This will make sure that it will be
recycled on an environmentally friendly manner, and will help to protect
the environment in which we all live.

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9
Chapter 1
Pin connections and connectors
CONNECTION STANDARDS
The in- and output connections for AUDAC audio equipment are performed corresponding
to international wiring standards for professional audio equipment.
Cinch (RCA):
For unbalanced line input connections
Tip: Signal Sleeve: Ground
White: Left Red: Right
XLR:
For balanced signal input connections
Pin 1: Ground
Pin 2: Signal +
Pin 3: Signal -
For balanced signal link-through connections
Pin 1: Ground
Pin 2: Signal +
Pin 3: Signal -
Wire up the system
The wiring of the system must be done according to the following rules, to guarantee a
proper functioning of the system in all circumstances.
1. Speaker cable for amplified outputs:
Minimum 2 x 1.5 mm²
If distance > 15m: 2 x 2.5 mm²)
2. Audio signal inputs (inputs & signal linkthrough outputs)
Must be connected with high-quality audio cable and high-quality
connectors

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Chapter 2
Front & rear panel
Front panel overview
ON
100
PROTECT
CLIP
SIGNAL
100
PROTECT
CLIP
SIGNAL EPA502
Front panel description
Volume control knobs:
These volume control knobs allow level adjustment for each individual channel.
Indicator LED’s:
These LED’s indicate the operation of the corresponding amplifier channel. A signal indicator,
clip indicator and protect indicator are available for each channel.
The signal indicator illuminates in green colour when the signal level exceeds the -20 dB level.
The clip indicator illuminates in yellow colour when the channel is working at maximum level.
To ensure the best signal-to-noise ratio, illumination of this indicator should only occur
at peak levels. When it illuminates frequently, the channel output will be overdriven and a
distorted ‘clipping’ sound occurs on the output.
The protect indicator illuminates in red colour when any overload, thermal overheating or
other fault is detected. It also illuminates for several seconds when powering on the amplifier
and slowly fades out when switching off the amplifier. When the protect LED is illuminated,
no signal will be available on the output.
Power switch with LED:
A power switch allows to turn the amplifier on and off. The indicator LED next to the power
switch indicates the current status of the amplifier. When operational, it illuminates in blue
colour. When switched to standby (energy-saving) mode, the power LED will illuminate in
orange colour. The amplifier switches automatically to standby mode when no input signal
is available for about 30 seconds and instantly switches back to operation when any signal
is detected.