COM3 - Receiver Audac - Free user manual and instructions

Product Type	Public Address Amplifier (Receiver)
Model	COM3
Dimensions (W x H x D)	270 mm x 76 mm x 230 mm
Net Weight	4.5 kg
Power Supply	230V AC, 50/60Hz
Power Consumption	42 W
Rated Output Power	30 W (at THD < 0.5%)
Available Output Taps	4 Ω (11V), 25V, 70V (163 Ω), 100V (333 Ω)
Input Sensitivity	Mic: -50 dB ± 3 dB; AUX: -30 dB ± 3 dB; Tele-Paging: -21 dB ± 3 dB
Frequency Response	80 Hz – 18 kHz (+1.5 / -3 dB at 1W)
Tone Controls	Bass (100 Hz) and Treble (10 kHz), ±12 dB each
Total Harmonic Distortion	< 0.5% at rated power, 1 kHz
Signal-to-Noise Ratio	> 90 dB at rated output
Inputs	3 x Mic (balanced, EURO block/1/4" phone), 2 x AUX (RCA), 1 x Tele-Paging (Euro block)
Outputs	Speaker outputs: COM and 4 Ω, 25V, 70V, 100V (Euro block)
Protection Features	Over-current, short-circuit, thermal protection with auto-limiting
Cooling	Convection (no fan)
Mounting	Desktop or 19" rack mount (brackets included)
Indicators	Power ON (blue LED), Signal, -20dB, Clip, Protect
Priority Muting	2-layer: MIC2~CH3, AUX1~AUX2 are muted by MIC1, Tele-Paging, and Chime
Built-in Chime	Selectable pre-announce chime
Fuse	T1A / 250V (5x20mm)
Operating Temperature	0°C to 40°C, 95% humidity non-condensing

Frequently Asked Questions - COM3 Audac

What is the output power of the COM3?

The COM3 delivers a rated output power of 30 watts with less than 0.5% total harmonic distortion at 1 kHz.

How do I connect speakers to the COM3?

Use the EURO block output terminals. Connect the COM terminal to the speaker negative (-) and one of the other terminals (4Ω, 25V, 70V, or 100V) to the speaker positive (+). Ensure you use either the low-impedance 4Ω tap or the high-impedance constant-voltage taps, never both simultaneously.

Can I use both 4Ω and 70V speakers at the same time?

No. Never use both the low-Z (4Ω) and high-Z (25V, 70V, 100V) terminals at the same time. This can damage the amplifier.

How do I adjust the input gain for microphones or auxiliary sources?

Each input channel (MIC1, MIC/AUX2, MIC/AUX3) has a GAIN trim pot on the rear panel. Rotate it to set the input sensitivity from -50 dB to -30 dB for mic channels and -30 dB to -6 dB for AUX channels. Use the front volume knobs for fine level control.

What is the priority muting feature?

The COM3 has a 2-layer priority mute. MIC1, Telephone Paging, and Chime have highest priority. When activated, they automatically mute MIC2, MIC/AUX2, MIC/AUX3, and AUX inputs (except same-priority sources).

How do I use the telephone paging function?

Connect a telephone interface unit or PBX to the TELE-PAGING EURO block connector (pins H, C, G). After dialing the interface, announcements are routed through the amplifier. The input sensitivity for this channel is -21 dB ± 3 dB.

How do I mount the COM3 in a 19-inch rack?

Use the included external brackets to mount the amplifier in a standard 19-inch rack. The unit occupies 2U (about 76 mm) of rack space.

What does the PROTECT LED indicate?

The PROTECT LED illuminates when the amplifier detects a fault such as over-current, short-circuit, or thermal overload. The amplifier will automatically limit output or shut down to prevent damage. Check speaker connections and ventilation.

How do I clean the COM3?

Disconnect the power cord. Use a soft, dry cloth to wipe the exterior. Do not use water, solvents, or abrasive cleaners. Ensure no liquids enter the ventilation openings.

What is the power consumption of the COM3?

The COM3 consumes 42 watts of power at normal operation. It is designed for 230V AC, 50/60 Hz mains supply.

USER MANUAL COM3 Audac

PROFESSIONAL AUDIO EQUIPMENT

Public Address Amplifier COM3 / COM6

User Manual & Installation Guide

AUDAC PROFESSIONAL AUDIO EQUIPMENT

User Manual & Installation Guide

© AUDAC

http://www.audac.eu

[e-mail]

Index

INTRODUCTION....3

ENVIRONMENT 4

SAFETY REQUIREMENTS 5

CAUTION-SERVICING 5

OVERVIEW FRONT AND REAR PANEL OF THE COM3/6 6

FRONT 6

REAR 6

DETAILS FRONT AND REAR PANEL OF THE COM3/6 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

Introduction

This section briefly describes the possibilities of the COM3/6 public address amplifier.

The COM3/6 public address amplifier was developed as an easy to use, flexible solution for flexible solution for multifunctional use.

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 14 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 radio-station, a microphone to make announcements, a telephone pager, ... and off course the doorbell of the shop.

Chapter 1

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.

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 so.

Note

This product conforms to the following European Standards: EN 50081-1: 1992, EN 50082-1: 1992, EN 60065: 199

Overview front and rear panel of the COM3/6

FRONT

REAR

Details front and rear panel of the COM3/6

FRONT PANEL

REAR PANEL

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 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.

Select the output wire and the connectors.

For the output connectors of the amplifier, the use of pre-built or professionally wired, high-quality 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.	14 AWG
41~60 ft.	12 AWG
61~100 ft.	10 AWG
101~150 ft.	8 AWG
151~200 ft.	6 AWG

Note: Leave custom wiring to qualified personnel. Class 2 wiring is required.

Caution: NEVER use shielded cable for output power wiring.

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 / 70V	81.6 Ω / 70 V
333 Ω / 100V	166 Ω / 100V

The impedances as indicated above represent the total speaker system impedances. The speaker connection is shown in the figure below.

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.

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.

Telephone pager/PBX

SIGNAL INPUT GAIN CONTROL

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

BLOCK DIAGRAM

graph TD
    A["TEL-PACE"] --> B["Amplifier"]
    B --> C["TRM(4+dB)"]
    C --> D["Ground"]
    D --> E["INPUT LEVEL"]
    E --> F["Low(100Hz)"]
    F --> G["High(10kHz)"]
    G --> H["MASTER"]
    H --> I["FAULT DETECTION AND PROTECTION"]
    I --> J["INDICATOR"]
    J --> K["OUTPUT TRANS"]
    K --> L["TDXV 70V 25V 4ohm CCW"]
    M["CH-5dB/-5dB"] --> N["Amplifier"]
    N --> O["TRM(4+dB)"]
    O --> P["Ground"]
    P --> Q["INPUT LEVEL"]
    Q --> R["Low"]
    R --> S["FAULT DETECTION AND PROTECTION"]
    T["DUE-6dB/-5dB"] --> U["Amplifier"]
    U --> V["TRM(4+dB)"]
    V --> W["Ground"]
    W --> X["INPUT LEVEL"]
    X --> Y["Low"]
    Y --> Z["FAULT DETECTION AND PROTECTION"]
    AA["DUE-8dB/-5dB"] --> AB["Amplifier"]
    AB --> AC["TRM(4+dB)"]
    AC --> AD["Ground"]
    AD --> AE["INPUT LEVEL"]
    AE --> AF["Low"]
    AF --> AG["FAULT DETECTION AND PROTECTION"]
    AH["POWER TRANS"] --> AI["AC COND"]
    AJ["+15V"] --> AK["SW POWER:"]
    AL["-15V"] --> AM["GND"] --> AN["Power Trans"]
    AO["FUSE"] --> AP["AC COND"]

Chapter

4

Additional

information

COM3/6

TECHNICAL SPECIFICATIONS

PERFORMANCE
Input sensitivity
	COM3	COM6
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
Tone Controls
100Hz, 10kHz ±	12dB ± 3dB
Signal to Noise Ratio at rated power output	Less than 90dB
Crosstalk at all control maximum -70dB at 1kHz
Rated output power at THD 0.5% 30	W	60 W
Total Harmonic Distortion (THD) at 1kHz rated power	Less than 0.5%
Power Band width at 1 kHz from speaker out tap	80Hz ~ 18kHz with less than 0.5% THD
DC Output Offset	Less than ± 3mV
Operating Temperature/Humidity at non-condensing	0° ~ 40°C at 95% humidity
Output Voltage and Impedance
4 Ω	11V	15.5 V
25V	21	10.5 Ω
70V	163 Ω	81.6 Ω
100V	333 Ω	166 Ω

Ω

CONSTRUCTION
	COM3	COM6
Cooling	Convection
Dimensions (W x H x D)	270 mm x 76 mm x 230 mm
Net Weight	4.5 Kg	5.1 Kg
Power Consumption	42 W	85 W

Cooled

Personal notes