DPA73/153
DPA73/153
AUDAC
PROFESSIONAL AUDIO EQUIPMENT
DPA73/153
Triple Channel Class-D Amplifier
User Manual &
Installation Guide
AUDAC PROFESSIONAL AUDIO EQUIPMENT
User Manual & Installation Guide
 AUDAC
http://www.audac.eu
info@audac.eu
Index
INTRODUCTION ..................................................................................................................................................................................................................... 3
ENVIRONMENT ...................................................................................................................................................................................................................... 4
SAFETY REQUIREMENTS ................................................................................................................................................................................................... 5
CAUTION – SERVICING ...................................................................................................................................................................................................... 5
OVERVIEW FRONT AND REAR PANEL .......................................................................................................................................................................... 6
FRONT PANEL OVERVIEW ................................................................................................................................................................................................ 6
FRONT PANEL DESCRIPTION .......................................................................................................................................................................................... 6
REAR PANEL OVERVIEW .................................................................................................................................................................................................. 7
REAR PANEL DESCRIPTION ............................................................................................................................................................................................. 7
CONNECTING THE AMPLIFIER ........................................................................................................................................................................................ 9
INPUT CONNECTIONS ........................................................................................................................................................................................................ 9
OUTPUT CONNECTIONS .................................................................................................................................................................................................. 11
CONNECTIONS STANDARDS .......................................................................................................................................................................................... 12
BLOCK DIAGRAM ............................................................................................................................................................................................................... 13
ADDITIONAL INFORMATION .......................................................................................................................................................................................... 14
TECHNICAL SPECIFICATIONS ....................................................................................................................................................................................... 14
PERSONAL NOTES............................................................................................................................................................................................................... 15
2
Introduction
This section briefly describes the possibilities of the DPA73/153 Class-D Power
Amplifiers.
T
he DPA series amplifiers are digital power amplifiers designed to meet the specialized
needs of sound contractors. They are designed in six different models of Class D
power amplifiers, divided in three different architectures to meet the requirements
for all kinds of applications.
They combine the best of all features in one single series of amplifiers, providing an
outstanding sound quality with all the known advantages of Class D Amplifiers. Such as the
excellent efficiency and very low heat dissipation. And due to the complete passively cooled
entity only a minimal of maintenance is needed, while ensuring maximum reliability.
The small size of a single rack space make them very interesting for fixed rack mount as well
as mobile applications.
The DPA73 and DPA153 are two channel (stereo) Class D amplifiers with an additional
channel for powering a subwoofer cabinet. They are capable of delivering a power up to 2 x
150 Watt to the stereo channels and 300 Watt to the subwoofer channel
The signal input connections are accommodated with balanced XLR connectors and signal
link through with other amplifiers is possible using the XLR output connectors. The
operation mode can be selected between Stereo mode, Bridge mode and Parallel mode.
The output connections are accommodated with Euro-Terminal block connectors.
3
1
Chapter
Environment
Do not place this unit in an enclosed environment such as a bookshelf or closet. Ensure
that there is adequate ventilation to cool the unit.
Do not place the unit in environments which contain high levels of dust, heat, moisture or
vibration.
Do not use the unit near water or other liquids. Make sure no water or other liquids can be
spilled, dripped or splashed on the unit.
This unit was developed for indoor use only. Do not use it outdoors.
Do not place objects on top of the unit.
Place the unit on a stable base or mount it in a stable 19” rack.
4
Safety Requirements
Always handle the unit with care.
Only use a grounded socket outlet and a power cord with grounding plug to plug in the
unit.
This unit is not a toy. It should not be operated by children.
Do not stick objects through the openings.
Do not open the unit (risk for electrical shock).

CAUTION – SERVICING
This unit contains no user serviceable parts. Refer all servicing to qualified
service personnel. Do not perform any servicing unless you are qualified to do
so.
Note
This product conforms to the following European Standards: EN 50081-1: 1992, EN
50082-1: 1992, EN 60065: 19
5
2
Chapter
Overview front and rear panel
Front panel overview
2. Satellite gain controls
3. Subwoofer gain control
1. Power Switch
4. Indicator LED’s
Description
1. Power switch:
By means of the power switch, the amplifier can be turned ON and OFF. When the amplifier is
switched on, the blue LED located above the power button will illuminate.
2. Satellite gain control knobs:
By means of these rotary gain control knobs, the level for each individual satellite channel (Left &
Right) can be controlled.
3. Subwoofer gain control knobs:
By means of this rotary gain control knob, the level for the subwoofer channel can be controlled.
4. Indicator LED’s:
These LED’s indicate the operation of the amplifier. There are three LED’s provided. A signal
indicator, a Clip indicator, and a Protect indicator. The green signal indicator LED’s will light up
when the input channel exceeds -20 dBu. The yellow clip LED’s will illuminate when the channel’s
output is being overdriven, and the red protect indicators illuminate when the thermal compression
begins, or any fault is detected.
6
Rear panel overview
5. AC power inlet with fuse
6. Crossover mode switch
8. Loudspeaker connections
7. Input connections
9. Operation mode switch
Description
5. Power inlet:
The mains power supply (100~240V AC / 50~60 Hz) has to be applied to this AC power inlet.
The connection is made by an IEC power connector and is fitted with a fuse. When replacing the
fuse, make sure that the value of the replacement fuse matches the value of the original fuse.
(T4AL/250V for DPA73 & T6.3AH/250V for DPA153)
6. Crossover mode switch:
By means of this switch, the crossover mode can be selected between two different operation
modes. Bass tones below 120 Hz are always filtered through a Low Pass filter (LPF), and are
audible through the “Subwoofer channel”, while the signal present on the Left & Right output
channels can be selected between “Full Range” and “Two-Way” operation.
When the switch is in left position, the signal for the Satellite outputs is filtered through a HighPass filter (HPF) and only the tones with a frequency above 120 Hz will be audible through the
Satellite channels, while when the switch is in the right position, the Full Range audio signal
(including tones below 120 Hz) will be audible through the audio channels.
The suitable operation mode depends of the type of application and the type of loudspeakers
which are used.
7
7. Input connections:
The input connections of the amplifier are performed using balanced XLR connectors. Every
channel has an XLR input connector and a XLR link output connector. The input signal from the
signal source, pre-amplifier or mixer should be connected to the XLR input connections. And by
means of the XLR link output connectors, the signal can be linked through to multiple amplifiers.
8. Loudspeaker connections:
The loudspeaker output connections are performed by means of Euro Terminal Blocks. A detailed
description about the best method for connecting the loudspeakers for every application can be
found in the next chapter, connecting the amplifier.
9. Operation mode switch:
By means of this switch, the operation mode of the amplifier can be selected between standard
stereo mode, parallel mode and bridge mode. For standard stereo applications, this switch should
be turned to center position for “Stereo” mode.
8
3
Chapter
Connecting the Amplifier
Input connections
The input connections of the amplifier are performed using balanced XLR connectors. Every
channel has an XLR input connector and a XLR link output connector.
The input signal from the signal source, pre-amplifier or mixer should be connected to the XLR
input connections. And by means of the XLR link output connectors, the signal can be linked
through to multiple amplifiers.
Between the input signal connections of the both channels is an operational mode switch provided.
By means of this switch, the operational mode of the amplifier can be selected. There are three
different operational modes available:
1) Stereo Mode:
This is the default mode how the amplifier is set in the factory, and will be the most
common used setting for most applications (Center position of the switch).
Connect both outputs from the stereo signal source to the Left and Right XLR
input connectors of the amplifier.
9
2) Bridge mono Mode:
In bridged mono mode, the power of both Satellite output channels (Left & Right)
is merged to deliver double the power to one single 8 Ohm load. The mode
selection switch should be positioned in the Bridge position (Left position of the
switch).
The output of the signal source should only be connected with the Left channel
XLR input connector of the amplifier.
For more information about how the loudspeakers should be connected in bridge
mode, refer to the “Output Connections” section of this user manual.
3) Parallel Mode:
In parallel mode (Right position of the switch), the amplifier is configured in a way
that only the signal applied to the XLR input connector of the Left channel will be
used, and will be amplified by both satellite and subwoofer output channels.
The output level of both channels can be individually controlled by means of the
rotary controls on front of the amplifier.
10
Output connections
The loudspeaker connections for every output channel are performed with a two pin EuroTerminal block connector. On the Left side is the output connector of the Subwoofer channel
provided, while on the right channel both output connectors for the Left & Right Satellite channels
are provided.
1) Stereo Mode:
Stereo mode will be the most commonly used operation method for this amplifier.
The Satellite loudspeakers should be connected to the “Left & Right” EuroTerminal block output connectors, while the subwoofer should be connected to
the “Sub” Euro-Terminal block connector. Depending of the position of the
“Crossover mode switch”, the signal which is available on the Left & Right
outputs can be determined. For a more detailed description of the “Crossover
mode switch” see “Rear panel overview” on page 7 of this user manual.
11
2) Bridge mono Mode:
When the amplifier is switched in bridge mode, there will be one single load
connected to the amplifier outputs. This load should be connected between the +
terminal of the Left channel and the – terminal of the Right channel.
3) Parallel Mode:
When the amplifier is switched in parallel mode, the connections for the
loudspeakers should be made in the same way as Stereo mode.
Note
Do not connect any 100V line transformers to the loudspeaker outputs of the amplifier.
The minimum load for the subwoofer channel is 8 Ohm.
Connection standards
The in- and output connections of AUDAC audio equipment are performed corresponding to
international wiring standards for professional audio equipment.
XLR:
1 = ground / shield
2 = +sig
3 = -sig
XLR female:
XLR male:
12
4
Chapter
Block Diagram
13
5
Chapter
Additional Information
Technical specifications
DPA73
DPA153
2 x 50 Watt
2 x 75 Watt
150 Watt
150 Watt
2 x 80 Watt
2 x 150 Watt
300 Watt
300 Watt
Performance
Rated power
(1 kHz, THD 1%)
Satellite Stereo @ 8 Ohm
Satellite Stereo @ 4 Ohm
Satellite Bridge @ 8 Ohm
Subwoofer @ 8 Ohm
Input Sensitivity
(Impedance 20 kOhm)
Frequency response (± 1 dB)
Signal to Noise ratio
Channel separation
THD at 1 kHz
(1/2 rated power)
Operation Temperature
/ Humidity at non condensing
Indicators
+ 4 dBm
20 Hz – 20 kHz
> 90 dB
>70 dB
Less than 0.1%
0° ~ 40°C at 95% Humidity
Protect (DC, Thermal, Overload)
Clip (0 dBr)
Signal (-24 dBr)
100~240V AC / 50~60 Hz
Power supply
Construction
Construction
Cooling
Mounting
Unit Height
Dimensions (W x H x D)
Color
Net Weight
Steel
Convection cooled
19” Rack
1 HE
482 x 44 x 330 mm
Black
4.58 Kg
4.83 Kg
14
Personal notes
15
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