ADS 3120 Plus Manuel utilisateur

Installation &

Operation Guide

ADS 3120 Plus

120W ac/dc

Mixer Amplifier

PLEASE NOTE: THIS MANUAL AND THE NOTES CONTAINED HEREIN ARE COPYRIGHT AND

MAY NOT BE REPRODUCED EITHER WHOLLY OR IN PART, IN ANY WAY WHATSOEVER,

WITHOUT WRITTEN CONSENT OF ADSworldwide.

Audio Design Services Ltd, St David’s House, Adcroft St, Higher Hillgate, Stockport, Cheshire SK1 3HW, UK.

TEL: +44 (0)161 666 6363 FAX: +44 (0)161 666 6366. WEB: www.ads-worldwide.net

Page 2 of 16

Product Compliance to EC directives for Standard Products

All standard products conform to the relevant directives, regulations and standards

for electronic and associated apparatus. The equipment is CE marked both on the

apparatus and the packaging.

Our products meet the appropriate British and International standards. A product

‘Declaration of Conformity’ Statement is available for each of the product ranges

(available on request). This covers both the EMC and Low Voltage Directives.

UNPACKING

While all ADSworldwide equipment is carefully packed to prevent damage in

transit, we recommend that the equipment is unpacked and inspected immediately

on receipt. If damage has occurred please advise your carrier and your supplier

who will arrange appropriate action.

If it is necessary to re-pack the equipment for onward shipping or returning to

ADSworldwide for service PLEASE ENSURE THAT THE ORIGINAL PACKING

OR EQUIVALENT IS USED.

Page 3 of 16

IMPORTANT

The lightning flash with arrowhead symbol, within an equilateral triangle, is

intended to alert the user to the presence of un-insulated dangerous voltage within

the product's enclosure that may be of sufficient magnitude to constitute a risk of

electric shock to persons.

The exclamation mark within an equilateral triangle is intended to alert the user to

the presence of important operating and maintenance instructions in the literature

accompanying the appliance.

TO PREVENT THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER

(OR BACK). NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO

QUALIFIED PERSONNEL.

Page 4 of 16

TABLE OF CONTENTS

INTRODUCTION .................................................................................................... 5

Features.............................................................................................................................. 5

Safety Information............................................................................................................... 5

OPERATION........................................................................................................... 7

General Installation............................................................................................................. 7

Front Panel ......................................................................................................................... 7

Rear Panel .......................................................................................................................... 8

Priority Connections ........................................................................................................... 8

MIC 1 and MIC 2 ..........................................................................................................................8

Input Connections............................................................................................................... 9

MIC 1 and MIC 2 ..........................................................................................................................9

MIC 3 and AUX 1 .........................................................................................................................9

MIC 4, MIC 5, AUX 2 and AUX 3 .................................................................................................9

Phantom Power ................................................................................................................ 10

Loudspeaker Output ......................................................................................................... 10

Loudspeaker Loading.................................................................................................................10

Booster Output.................................................................................................................. 11

Variable Output ..........................................................................................................................11

Fixed Output...............................................................................................................................11

dc Power ........................................................................................................................... 11

Facility Terminals.............................................................................................................. 11

dc Output....................................................................................................................................11

Restoration .................................................................................................................................11

Accessories ...................................................................................................................... 12

Some Possible Interfaces................................................................................................. 12

TROUBLESHOOTING.......................................................................................... 13

SPECIFICATIONS ................................................................................................ 14

NOTES ................................................................................................................. 15

WARRANTY CONDITIONS .................................................................................. 16

Page 5 of 16

Audio Design Services Ltd., St David’s House, Adcroft Street, Higher Hillgate, STOCKPORT SK1 3HW.

INTRODUCTION

Features

The ADS 3120 Plus is a 120 watt rms, two-zone, mixer amplifier suitable for powering

medium to large sound systems where music may be required in one area and quiet in the

rest of the building. Messages can be relayed to both areas using the priority switching

system.

Features include

220-240Vac at 50Hz or 24Vdc power operation

two balanced microphone inputs (MIC 1 and MIC 2) with priority paging & chime

three more balanced inputs switchable between microphone and line level

two outputs - one for speech and music, one for speech only

(this facility is only available on MIC 1 and MIC 2)

each input has phantom power facility

volume controls for all inputs, located on the front panel

separate bass, treble and master volume controls, located on the front panel

supplied with 19-inch rack mount ears.

Additional features on the new version (Plus) of the ADS 3120 include

XLR and ¼ inch 3-pole jack combination sockets for MIC 1, MIC 2 and MIC 3

5-pin DIN sockets for MIC 1 and MIC 2

(to accept microphones fitted with a 5-pin DIN plug – e.g. the ADS Signet 1A)

volume restoration

trim control on MIC 1 and MIC 2.

Safety Information

WARNING – THIS APPLIANCE MUST BE EARTHED

IMPORTANT

The wires in the mains lead are coloured in accordance with the following code

Green and yellow Earth (E); Blue: Neutral (N); Brown: Live (L).

As the colours of the wires in the mains lead of the apparatus may not correspond with the

coloured markings identifying the terminals in your plug proceed as follows

the wire coloured green and yellow must be connected to the terminal

marked by the letter E (or the safety earth symbol), or coloured green and

yellow

the wire coloured blue must be connected to the terminal marked with the

letter N or coloured black

the wire coloured brown must be connected to the terminal marked with the

letter L or coloured red.

Page 6 of 16

If a 13-amp (BS1363) plug or other type of plug is used, a 5-amp fuse must be fitted either

in the plug or at the distribution board.

For mains connection other than in the UK, refer to your local requirements for connection

to the mains supply.

IEC Mains Inlet Socket

Brown Live

Fuse (max 5A)

Fuse Holder

13A Mains Plug Wiring (UK)

Green/Yellow Earth

Blue Neutral

Page 7 of 16

Audio Design Services Ltd., St David’s House, Adcroft Street, Higher Hillgate, STOCKPORT SK1 3HW.

OPERATION

General Installation

ALWAYS ensure that the equipment is properly earthed (grounded).

Operating without an earth is dangerous and may cause high levels of

audible hum from the speaker outputs.

NEVER remove the top cover of the amplifier or make an internal adjustment

with the ac mains supply connected. All internal servicing should be

performed by a competent and qualified engineer.

DO NOT expose the unit to rain or moisture. If any fluids or foreign objects

should enter the unit, disconnect the power plug immediately.

DO NOT site the equipment in locations exposed to direct sunlight, near

heaters or other heat sources. Avoid locations with high humidity or dust

levels.

DO NOT obstruct the ventilation slots in the amplifier case and allow

adequate ventilation. (Ensure that a 1U ventilation panel is fitted above the

unit if the amplifier is rack-mounted.)

DO NOT run microphone cables near mains, data, telephone or 100V lines.

AVOID jointing the microphone cables if possible. If this is unavoidable, make

sure a good screen connector is used.

ALWAYS use a balanced or floating low impedance microphone on long

microphone runs, terminating in a balanced input.

Front Panel

1 2 3 4 5 6 7 8 9 10 11

1 OVERLOAD LED INDICATOR 7 BASS CONTROL

2 MIC 1 8 TREBLE CONTROL

3 MIC 2 9 MASTER GAIN

4 MIC 3 / AUX 1 10 POWER LED

5 MIC 4 / AUX 2 11 POWER ON/OFF SWITCH

6 MIC 5 / AUX 3

Page 8 of 16

Rear Panel

12 13 14 15 16 17 18 19 20 21 22 23 24

12 MAINS SOCKET

13 DC IN TERMINALS

14 LOUDSPEAKER TERMINALS

15 BOOSTER OUT (VARIABLE)

16 BOOSTER OUT (FIXED OR VARIABLE)

17 AUX 3

18 MIC 5

19 AUX 2

20 MIC 4

21 AUX 1

22 MIC 3

23 MIC 2

24 MIC 1

25 MIC 1 Priority Connection

26 MIC 2 Priority Connection

27 MIC 1 Trim Control

28 MIC 2 Trim Control

Priority Connections

MIC 1 and MIC 2

Pin Function

1 Signal + Positive signal input from the microphone.

2 Ground Connect to chassis or screen.

3 Signal - Negative signal input from the microphone.

4 Access Close pins 4 and 5. For priority access.

5 Access Close pins 4 and 5. For priority access.

26 25

28 27

180

5-pin DIN socket

Page 9 of 16

Input Connections

MIC 1 and MIC 2

Microphone inputs 1 and 2 use an XLR / ¼” 3-pole jack combination socket and a 180˚

5-pin DIN socket. Any of these connectors may be used. However if priority is required it

may be easier to use the DIN socket and compatible ADS Signet microphone. (See

Priority Connections 25 and 26 and wiring table on Page 8 for the DIN socket.)

The connections on an XLR plug are numbered 1 to 3 and should be connected as follows

Pin 1: Ground (or Screen). Pin 2: Signal+ (or Hot). PIN 3: Signal- (or Cold)

If the signal source is not balanced then Pin 1 should be connected to Pin 3 along with the

Ground (or Screen).

Each of the microphone inputs 1 and 2 is provided with a trim control on the rear panel

(see diagram on Page 8). This control adjusts the sensitivity of the input to allow for a

wide range of input sources. Adjust this control to reduce noise and provide an acceptable,

undistorted output level.

MIC 3 and AUX 1

This microphone input uses an XLR / ¼” 3-pole jack combination socket (see above) and

is balanced. There are no priority functions available with this input. The input can be

reconfigured as an auxiliary input as follows

disconnect the power supply then remove the amplifier top cover

locate the correct switch on the rear PCB

(Three switches are located on the rear PCB. The switch required is the left

hand one when viewed from the front of the amplifier)

set the switch to the position nearest to the rear panel

replace the amplifier top cover.

The auxiliary input uses a phono connection (see below).

Pin (Signal)

Sleeve (Screen)

MIC 4, MIC 5, AUX 2 and AUX 3

Each microphone input uses a ¼” 3-pole jack connection (see below).

Ring (Signal-)

Tip (Signal+)

Sleeve (Screen)

Each auxiliary input uses a phono connection (see above).

XLR/Jack Combination Socket

XLR Plug

Pin Configuration

Balanced Unbalanced

Page 10 of 16

All inputs are configured as AUX inputs. To configure them as balanced microphone inputs

proceed as follows

disconnect the power supply then remove the amplifier top cover

locate the correct switch on the rear PCB

(MIC 4 is the centre one and MIC 5 the right hand one when viewed from

the front of the amplifier)

set the switch to the position nearest to the front panel

replace the amplifier top cover.

Phantom Power

Each of inputs has the option of phantom power, providing 18Vdc phantom power on the

XLR socket. This is often used to power external low current devices such as electret

condenser microphones. Phantom power is selected by jumpers located internally on the

input board of the amplifier.

NEVER remove the top cover of the amplifier or make an internal

adjustment with the ac mains supply connected. All internal

adjustment must be performed by a competent, qualified engineer.

Having taken all the necessary electrical safety precautions, remove the top cover of the

amplifier and locate the phantom power jumpers for the five microphone inputs. Select the

appropriate jumper setting (by moving the jumper if necessary) for phantom power to be

off or on, as indicated on the inset diagram below.

Loudspeaker Output

Two loudspeaker outputs are available – Music & Speech and Speech Only.

Music & Speech gives an output at all times.

Speech Only gives an output during a priority condition.

Loudspeaker Loading

To allow sufficient transient overload margin it is suggested that the output load should not

exceed approximately 70% of the rated power output.

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