Glensound Signature Series User manual

ADA2S12MGT
Analogue Distribution Amplifier
2 in (1 Stereo) to 12 out (Mono) with gain controls &
output transformers
User Guide

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Glensound Electronics Ltd
Thank you for choosing a new Glensound product.
All rights reserved.
Information contained in this manual is subject to change without notice, if in
doubt please contact us for the latest product information.
If you need any help with the product then we can be contacted at:
Glensound Electronics Ltd
1 –6 Brooks Place
Maidstone
Kent
ME14 1HE
United Kingdom
Telephone: [phone]
Fax: [phone]
EMAIL ADDRESSES
General enquires: [e-mail]
Technical enquires: [e-mail]
Sales enquires: [e-mail]

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This symbol is intended to warn that
dangerous voltages within the product are
present and constitute a risk of electric
shock.
This symbol is intended to highlight that
there are important operating &
maintenance instructions in the literature
accompanying this unit.
IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructions
2) Keep these instructions
3) Heed all warnings
4) Follow all instructions
5) Do not use this apparatus near water
6) Clean only with a dry cloth
7) Do not block any ventilation openings. Install in accordance with manufacturer’s
instructions
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat
9) Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug
has 2 blades with one wider than the other. A grounding type plug has 2 blades and third
grounding prong. The wider blade or the 3rd prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet
10) Protect the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles and the point where they exit from the apparatus
11) Only use attachments/ accessories specified/ supplied by the manufacturer
12) Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution when moving
the cart/ apparatus combination to avoid injury from tip over
13) Unplug tis apparatus during lightning storms or when unused for long periods of time
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as power supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped
15) Do not attempt to modify this product. Doing so could result in personal injury and/ or
product failure

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IMPORTANT: MAINS PLUG WIRING INSTRUCTIONS
This Signature unit is supplied with a moulded mains plug fitted to the AC mains
lead.
Mains wiring colours/ connections:
The Green/ Yellow or Green wire must be connected to the terminal in the plug
marked ‘E’ or with the Earth Symbol.
The Blue or Black wire must be connected to the terminal in the plug marked ‘N’
(Neutral).
The Red or Brown wire must be connected to the terminal in the plug marked ‘L’
(Live).
THIS UNIT MUST BE EARTHED
THIS UNIT IS FITTED WITH AN INTERNAL MAINS FUSE.
The fuse is located internally between the Live terminal of the IEC plug and the
Live input of the power supply. The fuse should only be changed by a qualified
service engineer. If replacing the fuse care should be taken to fit a correctly rated
replacement. The fuse rating can be found in the technical specifications page of
this handbook.

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EU DECLARATION OF CONFORMITY FOR:
ADA2S12MGT
Stereo In Mono Out Audio Distribution Amplifier
This declaration of conformity is issued under the sole responsibility of the
manufacturer.
This equipment is manufactured by Glensound Electronics Ltd of Brooks
Place Maidstone Kent ME14 1HE is marked and conforms to the
following Union harmonisation legislation:
Low Voltage Directive: EN60065 and EN62368-1:2014
Emissions: BS EN55032:2015
Immunity: BS EN55035:2017
Signed for and on behalf of Glensound Electronics Ltd.
Gavin Davis, Managing Director
Maidstone, Kent, England
Date: 18/03/2019

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RoHS DIRECTIVE
EC directive 2002/95/EC restricts the use of the hazardous substances listed
below in electrical and electronic equipment.
This product conforms to the above directive and for this purposes, the maximum
concentration values of the restricted substances by weight in homogenous
materials are:
Lead
0.1%
Mercury
0.1%
Hexavalent Chromium
0.1%
Polybrominated Biphenyls
0.1%
Polybrominated Diphenyl Ethers
0.1%
Cadmium
0.01%

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WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT
REGULATIONS 2006 (WEEE)
Glensound Electronics Ltd is registered for business to business sales of WEEE
in the UK our registration number is:
WEE/JJ0074UR

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PRODUCT WARRANTY:
All equipment is fully tested before dispatch and carefully designed to provide you
with trouble free use for many years.
We have a policy of supporting products for as long as possible and guarantee to
be able to support your product for a minimum of 10 years.
For a period of one year after the goods have been despatched the Company will
guarantee the goods against any defect developing after proper use providing
such defects arise solely from faulty materials or workmanship and that the
Customer shall return the goods to the Company’s works or their local dealer.
All non-wear parts are guaranteed for 2 years after despatch and any defect
developing after proper use from faulty materials or workmanship will be repaired
under this warranty providing the Customer returns the goods to the Company's
works or their local dealer.

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ADA2S12MGT Analogue Distribution Amplifier
Handbook Contents
Issue 1,
Description Page No.
Contents
IMPORTANT SAFETY INSTRUCTIONS........................................................................................................................ 3
PRODUCT WARRANTY:...................................................................................................................................................... 8
OVERVIEW ........................................................................................................................................................................ 10
PHYSICAL INSTALLATION ............................................................................................................................................... 11
AUDIO BLOCK DIAGRAM .................................................................................................Error! Bookmark not defined.
EXAMPLES OF USE........................................................................................................................................................... 13
1. Radio Station CTA............................................................................................................................................... 13
USER CONTROLS.............................................................................................................................................................. 15
1. Individual Output Gain/ Loss Controls ............................................................................................................. 15
2. Input Gain/ Loss Controls .................................................................................................................................. 15
3. +/-12V DC Input.................................................................................................................................................. 16
4. Mains Input ......................................................................................................................................................... 16
5. Left Audio Input.................................................................................................................................................. 16
6. Mono Outputs .................................................................................................................................................... 16
7. Right Audio Input ............................................................................................................................................... 16
WIRING INFORMATION ................................................................................................................................................... 17
1. Standard Pin Outs............................................................................................................................................... 17
2. Wiring to unbalanced devices........................................................................................................................... 18
TECHNICAL SPECIFICATION............................................................................................................................................ 19

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OVERVIEW
The Glensound Signature Series ADA2S12MGT is a professional audio distribution amplifier. It
is manufactured using high quality components and low noise audio circuits to provide many
years of trouble free use.
Although traditionally a broadcast manufacturer, Glensound’s products are equally at home
in professional and high end home studios, industrial installations and live pro sound
environments. The ADA2S12MGT can therefore be used in a number of applications.
The ADA2S12MGT features two individual transformer balanced audio inputs on Neutrik
XLRs. These inputs are summed together and the output is fed to 12 individual output
amplifiers each fully isolated from each other and transformer balanced, each is fed via its
own preset gain control.
It is possible to connect the balanced audio inputs & outputs to domestic style unbalanced
audio circuits and the preset gain controls provide sufficient output level adjustment to allow
this.
The unit operates as a stereo to mono converter and distribution amplifier, but it can also be
fed with just a mono input signal that is distributed to the 12 mono outputs.
The ADA2S12MGT is powered from an internal switch mode mains power supply fed from a
filtered IEC mains plug suitable for use Worldwide. It has an internal fuse for safety. The unit
can also alternatively be powered from an external +/-12V DC power source (such as the
Signature Series PS1). If both mains and external DC power sources are present then, if one
power source were to fail the unit would continue to work seemlessly from the other source.

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PHYSICAL INSTALLATION
The Glensound Signature Series have been designed to be highly versatile for installation and
can be installed in 19” racks with either their front or rear panels facing the front of the rack.
They can also be mounted underneath desks or work tops and can be either permananetly
mounted or stood (using the supplied feet) on top of desks or worktops.
INSTALLING SIGNATURE SERIES IN A 19” RACK
Firmly hold the signature subrack within the 19” rack and locate in 1RU of space. Use the
supplied 6mm rack screws to securly attach the unit to the rack.
INSTALLING ADHSIVE FEET FOR NON PERMANENT TABLE TOP MOUNTING
Remove the front rack ears (if they are not required), turn the unit upside down and attach
the supplied 4 sticky feet as per the above drawing.
Signature
Series
KeepsWorking
PWR ON
PART No
50/60Hz 2.7 Watts
100-240V
+/-12V - - -
PIN 1 = GND
PIN 3 = -12V (100mA)
PIN 2 = +12V (100mA)
Top

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SWAPPING RACK EARS TO ALLOW THE REAR TO BE INSTALLED AT THE FRONT OF A
RACK
First remove the 4 silver button head screws that fix the rack ears onto the front of the unit as
shown in the top picture above.
Remove the rack ears and turn the unit around for access to its back panel.
Re-fit the 2 rack ears using the same 4 silver button head screws that were removed from the
front as per the bottom picture above.
USING THE MOUNTING HOLES FOR PERMANENTLY ATTACHING THE UNIT ABOVE OR
BELOW A WORKTOP/ DESK
Use either the top or bottom mounting holes as indicated above to use suitable screws to
attach the signature unit to a worktop or bench. **PLEASE ENSURE THAT YOU USE SUITABLE
FIXINGS**
Series
Signature
Keeps Working
PWR ON
PART No
50/60Hz 2.7 Watts
100-240V
+/-12V - - -
PIN 1 = GND
PIN 3 = -12V (100mA)
PIN 2 = +12V (100mA)
Series
Signature
KeepsWorking
PART No
PWR ON

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EXAMPLES OF USE
1. Radio Station CTA
The main stereo programme audio from a radio station needs to be distributed across
multiple mono platforms. The output from the desk or automation system no longer just
heads off to the transmitter. The audio must be distributed across all of the relevant services
that require a connection of the original programme audio.
In this example, the Signature ADA1S12MGT provides 6 mono outputs outputs of the main
programme audio. One output connects to the AM transmitter as an alternative to the main
FM broadcast feed. As multiple multiple monitoring headphones are required in the studio,
another output connects to a separate headphone distribution amplifier. This station also
broadcasts online, so another output connects to a PC to become the internet broadcast
stream. Local monitoring is required, so one feed goes to the local monitoring system. The
transmitter B chain is on ISDN, so one output goes to the mono ISDN backup codec. And the
final output connects to another PC that manages all of the stations logging requirements.
All of these distributed sources may require different levels. With the Signature
ADA1S12MGT, each distributed output can have a different gain level set so that it matches
the incoming level requirements of each source. For example, the feed that goes to the AM
transmitter link will be connected to professional equipment expecting normal line up levels.
However, the station logging may be on a domestic grade PC and require a much lower input
level to be sent to it. Using the ADA1S12MGT, a separate gain level can be set for each
output.
Mixer
Output
AM
Transmiter
Local
Monitoring
Digital
Services
Logging
ISDN
Backup
2 x XLR3
(balanced or
unbalanced)
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
OUTPUT
GAIN
OUTPUT
GAIN
OUTPUT
GAIN
OUTPUT
GAIN
OUTPUT
GAIN
OUTPUT
GAIN

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2. Commentary Feed @ IBC
A stereo feed is connected to the Signature ADA2S12MGT. This could be the master
programme mix output from a host commentary system at a sports stadium. This needs to be
distributed to all the relevant broadcasters who want to take the host commentary audio.
Twelve outputs from the ADA2S12MGT are available, which all contain the original audio, and
are available to distribute to all of the relevant 12 broadcasters. As the required levels may be
different for each broadcaster the gain can be adjusted independently for each output.
Commentators’
Mix
2 x XLR3
(balanced or
unbalanced)
1 x XLR3
Broadcaster 1
Broadcaster 3
Broadcaster 4
Broadcaster 5
Broadcaster 6
Broadcaster 2
1 x XLR3
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
OUTPUT GAIN
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
Broadcaster 12
Broadcaster 10
Broadcaster 9
Broadcaster 8
Broadcaster 7
Broadcaster 11
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3
1 x XLR3

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USER CONTROLS
1. Individual Output Gain/ Loss Controls
The front panel preset gain controls are recessed to prevent accidental usage. A small
screwdriver is required to adjust the controls.
There are 12 individual preset gain controls, one for each output.
To turn the output gain down (i.e. lower the output level of that channel) rotate the preset
pot anti-clockwise. To turn the output gain up (i.e. increase the output level of that channel)
rotate the preset pot clockwise.
These gain controls are factory set for unity gain (Note the input gain controls are not set at
unity). The overall gain / loss available is +10dB of gain and -15dB of loss.
2. Input Gain/ Loss Controls
The front panel input preset gain controls are recessed to prevent accidental usage. A small
screwdriver is required to adjust the controls.
There are 2 individual preset gain controls, one for each input.
To turn the input gain down (i.e. lower the output level of that channel) rotate the preset pot
anti-clockwise. To turn the input gain up (i.e. increase the output level of that channel) rotate
the preset pot clockwise.
The overall gain/ loss available is +6dB of Gain and -21dB of loss.
These inputs are factory set such that 2 Coherent -6dB inputs produce 0dB on the outputs.
1. Individual Output Gain/ Loss Controls
2. Input Gain/ Loss Controls

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5. Left Audio
Input
6. Twelve mono Outputs
CONNECTIONS
3. +/-12V DC Input
This 4 pin XLR plug is used to power the device from external DC sources.
Internally the output of this DC input and the output if the mains supply are ‘dioded’ together
meaning that they can be used as redundant power sources.
4. Mains Input
A filtered IEC plug is provided for connecting the ADA2S12MGT to a mains supply for
powering. A wide range switch mode power supply is fitted making it suitable for use
Worldwide.
5. Left Audio Input
This transformer balanced audio input can if required be connected to unbalanced outputs.
Its output is mixed together with the Right Audio input to provide a mono circuit to the 12
outputs.
6. Mono Outputs
These balanced outputs are transformer isolated for maximum possible protection. Each
output is fully isolated from all the others. They all have the same audio source available to
them, but their output levels can be individually adjusted.
7. Right Audio Input
This transformer balanced audio input can if required be connected to unbalanced outputs.
3. +/-12V DC Input
4. Mains Input
100-240VAC
7. Right Audio
Input

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Its output is mixed together with the Right Audio input to provide a mono circuit to the 12
outputs.
WIRING INFORMATION
1. Standard Pin Outs
12
3
XLR SOCKET (FEMALE)
1 2
3
XLR PLUG (MALE)
4
1
23
STANDARD XLR AUDIO PINOUTS:
1: Ground/ Earth
2: INPHASE/ POSITIVE/ MIC +
3: MATE/ NEGATIVE/ MIC -
EXTERNAL DC INPUT:
PIN 1: GND
PIN 2: +12V
PIN 3: -12V
4 PIN XLR PLUG (MALE)

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2. Wiring to unbalanced devices
The input & output circuits of the Signature Series can be connected to unbalanced (domestic
style) devices. The wiring diagrams below show a mono jack plug as the unbalanced end of
the cable but this of course could easily be a different type of connector such as an RCA
Phono or ‘D’ type connector.
TO TIP
TO SLEEVE
TO TIP
TO SLEEVE
BALANCED OUTPUT
ON SIGNATURE UNIT
UNBALANCED INPUT
OF EXTERNAL DEVICE
BALANCED INPUT
ON SIGNATURE UNIT UNBALANCED OUTPUT
OF EXTERNAL DEVICE
12
3
21
3TIP
SLEEVE
TIP
SLEEVE

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TECHNICAL SPECIFICATION
FEATURES
POWERAUDIO
PHYSICAL
Mains Input
Size
Internal Mains Fuse
Shipping Weight
DC Input
Mechanics
AC Consumption
Weight
Shipping Carton
Filtered IEC, 100 to 240VAC
47 - 63Hz
445 x 123 x 44mm (LxDxH) no rack ears
482mm 19” (1RU) with rack ears
20mm 500mA Anti Surge
3.5kg
E & OE
4 Pin Neutrik XLR plug +/- 12V
All aluminium construction, anodized and
laser etched
1.5 Watts @ 230VAC
1.75kg
Rugged export quality cardboard carton
610 x 420 x 130mm LxDxH
Frequency Response
Input Impedance
Common Mode Rejection @ Line Up
Maximum Levels
Distortion Ref +8dBu output
Input & Output Type
Gain Range
Output Impedance
Noise
<+/-1dB 20Hz to 24kHz
>30k Ω
> -67dB @ 20kHz
>-112dB @ 1kHz
>-100dB @ 50Hz
>+28dB Input
THD+N 0.003% @ 10kHz
THD+N 0.005% @ 1kHz
THD+N 0.06% @ 100Hz
Transformer balanced (can be wired
Unbalanced) on Neutrik 3 pin XLR socket
+10dB to -15dB on each output
=<50 Ω
>+24dBu Output
-81dBu @ line up unweighted
RMS (22Hz to 22kHz)
+6dB to -21dB on each input
+12V = 30mA -12V = 24mA