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Public
A
AUDAC
PROFESSIONAL AUDIO EQUIPMENT
Public Address Amplifier COM3 / COM6
ddress Amp
COM3/6
User Manual &
Installation Guide
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AUDAC PROFESSIONAL AUDIO EQUIPMENT
User Manual & Installation Guide
AUDAC
http://www.audac.eu
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Index
INTRODUCTION ..................................................................................................................................................................................................................... 3
ENVIRONMENT ...................................................................................................................................................................................................................... 4
SAFETY REQUIREMENTS ................................................................................................................................................................................................... 5
CAUTION – SERVICING ...................................................................................................................................................................................................... 5
OVERVIEW FRONT AND REAR PANEL O F TH E COM3/6 .......................................................................................................................................... 6
FRONT .................................................................................................................................................................................................................................... 6
REAR ...................................................................................................................................................................................................................................... 6
DETAILS FRONT AND REAR PANEL OF THE CO M3 /6 ............................................................................................................................................... 7
FRONT PANEL CONTROLS ................................................................................................................................................................................................ 7
REAR PANEL ......................................................................................................................................................................................................................... 7
GETTING STARTED .............................................................................................................................................................................................................. 8
CONNECTIONS ..................................................................................................................................................................................................................... 10
OPERATION ........................................................................................................................................................................................................................... 12
BLOCK DIAGRAM ............................................................................................................................................................................................................... 13
ADDITIONAL INFORMATION COM3 /6 .......................................................................................................................................................................... 14
PERSONAL NOTES............................................................................................................................................................................................................... 15
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Introduction
This section briefly describes the possibilities of the COM3/6 public address amplifier.
he COM3/6 public address amplifier was developed as an easy to use, flexible solution for
flexible solution for multifunctional use.
T
During the development of the COM3/6, the AUDAC-engineers wanted to achieve four goals:
- Delivering a flexible audio solution to control multiple functions
- Easy to use
- Excellent sound quality
- Modern and advanced design
The COM3/6 has 1 Telephone paging input with EURO block terminal, 3 microphone and 2 line
inputs with ¼ inch phone and RCA jacks, a 30W(COM3)/60W(COM6) rated power output, an
acceptable wide range input level (up to 44dB), 2-layer priority muting, a protection system which
detects over current and provides current limiting and thermal protection, a built-in user selectable
preannounce chime, 2 band tone controls and a low distortion and low noise level. Thanks to its
external brackets, the COM3/6 can be mounted on a desktop or in a 19 inch rack.
The COM3/6 can be used in commercial applications such as restaurants, hotels, shops,
warehouses, professional offices, public buildings, …
A simple example: when installed in a shop, you could connect: a tuner to play your favorite radiostation, a microphone to make announcements, a telephone pager, … and off course the doorbell
of the shop.
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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 block the ventilation openings.
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.
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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 of the COM3/6.
Do not open the unit (risk for electrical shock).
The COM3/6 contains several ‹ jumpers › which can be set. These settings may only be
done by qualified people.
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
Note
This product conforms to the following European Standards: EN 50081-1: 1992, EN
50082-1: 1992, EN 60065: 199
so.
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Overview front and rear panel of the COM3/6
FRONT
REAR
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Details front and rear panel of the COM3/6
FRONT PANEL
Input channel volume knobs (MIC 1,
MIC/AUX2, MIC/AUX3)
2 Band tone control knobs
(100Hz/10kHz)
Indication LEDs
Power button & ON-
Master volume control knob
LED
REAR PANEL
AC Fuse
Speaker output connectors (4 Ohm,
Power cable
25V, 70V and 100V).
Gain control knobs for variable input level
Telephone paging
input connector
Signal input connections
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Getting Started
Before you install the COM3/6 amplifier, make sure you disconnect it: put the power button in
the ‘OFF’ position and turn all level controls down by turning them counterclockwise. When
installed, the COM3/6 public address amplifier can be switched on by pressing the power button
on the front panel. The blue ‹ ON › led will light up if the device is powered-up.
WIRING
Select the input wire and the connectors.
The use of pre-built or professionally wired balanced line 22 to 24 gauge cables is recommended.
The figure on the next page shows the connector pin assignments for wiring. You can also use the
RCA input connections for unbalanced inputs.
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Select the output wire and the connectors.
For the output connectors of the amplifier, the use of pre-built or professionally wired, highquality and heavy gauge speaker wires is recommended. EURO blocks can be used for the output
connectors. Prevent short circuits: wrap or insulate exposed loudspeaker cable connectors.
Use the guidelines below to select the appropriate wire size, based on the distance from the
amplifier to the speaker. The wire sizes apply to the 4 Ohm tap.
Distance Wire size
Up to 25 ft. 16 AWG
26~40 ft.
41~60 ft.
61~100 ft.
101~150 ft.
151~200 ft.
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
Note: Leave custom wiring to qualified personnel. Class 2 wiring is required.
Caution:
NEVER use shielded cable for output power wiring.
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V
Connections
Select the input wire and the connectors
INPUT
Connect microphones or balanced line-level sources to the balanced inputs of the mixer-amplifier.
Set the Gain Volume accordingly. Connect unbalanced line-level signals to RCA input connectors.
OUTPUT
Maintain proper polarity on the output connectors.
For each output channel, you connect the output EURO block terminals to the loudspeaker loads.
Use terminals that are marked with COM and 4Ω for a 4 Ohm loudspeaker load, or use terminals
marked with COM and 25V, 70V or 100V for constant-voltage loudspeaker loads.
Connect the COM terminal to the speaker negative (-) lead. Connect one of the other terminals to
the speaker positive (+) lead.
Impedance and output voltage:
COM3 COM6
4 Ω / 11V 4 Ω / 15.5V
21 Ω / 25V 10.5 Ω / 25V
163 Ω / 70
333 Ω / 100
81.6 Ω / 70 V
166 Ω / 100V
The impedances as indicated above represent the total speaker system impedances. The speaker
connection is shown in the figure below.
4Ω
Matching
8Ω 8Ω
10
transformer
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Caution: Never use both the Low-Z (4Ω) and Hi-Z (25V, 70V and 100V) terminals at the same
time.
Following image shows a WRONG
connection.
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Operation
TELEPHONE PAGING
Connect the TELE-PAGING connector of the mixer-amplifier to the telephone interface
unit/PBX like telephone pager. Announcing by telephone is possible, after you’ve dialled up to
telephone interface unit/PBX.
SIGNAL INPUT GAIN CONTROL
Telephone pager/PBX
The COM3/6 public address amplifiers are able to accept a variable and wide range of input
signals with trim pot. To accept variable external equipment, you adjust the trim pot in a range of
44dB. Following image shows the acceptable input sensitivity per channel.
PRIORITY CONTROL
The COM3/6 has a 2-layer priority mute function. When a higher level source is activated, other
input signals are muted automatically, except for the same priority level source.
MIC2~CH3, AUX1~AUX2 › MIC1, Telephone Paging, Chime
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BLOCK DIAGRAM
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Sig
60
p
t
Op
g
V
P
r
Additional information COM3/6
TECHNICAL SPECIFICATIONS
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PERFORMANCE
Input sensitivity
COM3
Balanced microphone channels -50dB ± 3dB
Unbalanced AUX channels -30dB ± 3dB
Tele-Paging -21dB ± 3dB
At 1W from speaker out tap, 80Hz ~ 18kHz +1.5/-3dB
100Hz, 10kHz ± 12dB ± 3dB
nal to Noise Ratio at rated power output
Crosstalk at all control maximum -70dB at 1kHz
Rated output power at THD 0.5% 30 W
Total Harmonic Distortion (THD) at 1kHz rated power Less than 0.5%
Power Band width at 1 kHz from speaker out ta
DC Output Offse
erating Temperature/Humidity at non-condensin
Output Voltage and Impedance
4 Ω 11
25V 21 Ω
70V 163 Ω 81.6 Ω
100V 333 Ω
COM6
Tone Controls
Less than 90dB
W
80Hz ~ 18kHz with less than 0.5% THD
Less than ± 3mV
0° ~ 40° C at 95% humidity
15.5 V
10.5 Ω
166 Ω
CONSTRUCTION
COM3
Cooling Convection Cooled
Dimensions (W x H x D) 270 mm x 76 mm x 230 mm
Net Weight 4.5 Kg 5.1 Kg
ower Consumption 42 W
COM6
85 W
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Personal notes
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