XTA DNA20 User manual

Page2 DNASeries—DNA20OperatingInstructions
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DNA Series — DNA20 Operating Instructions Page 3
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CONTENTS
DECLARATION OF CONFORMITY............................................................................ 4
THANKS................................................................................................................... 5
INTRODUCTION....................................................................................................... 5
IMPORTANT SAFETY INSTRUCTIONS .................................................................... 6
INSTRUCTIONS DE SECURITE IMPORTANTES ...................................................... 7
Installing Your Amplifier: Unpacking .................................................................... 8
Additional Symbols and Warnings................................................................................................8
Installing Your Amplifier: Electrical Considerations............................................. 9
Installing Your Amplifier: Mechanical Considerations.........................................10
Installing Your Amplifier: RF Emissions ..............................................................10
About Your Amplifier: Dynamic Amplifier Performance Measurements ............ 11
Connecting To Your Amplifier: Line Inputs and Outputs......................................12
Connecting To Your Amplifier: Speaker Outputs..................................................13
Connecting To Your Amplifier: Bridged (Mono) Operation...................................14
Operating Your Amplifier: Front Panel Controls and Indicators..........................15
Operating Your Amplifier: Rear Panel Sockets and Switches .............................16
Operating Your Amplifier: Initial Set-up and Switching On..................................17
Switching On…..............................................................................................................................17
Operating Your Amplifier: Switching between analogue & networked audio .....18
Operating Your Amplifier: General Purpose Connections (GPIO) Port ................19
Internal Adjustments to Your Amplifier: Fixed fan speed................................... 20
Internal Adjustments to Your Amplifier: Auto-standby mode ............................ 20
Internal Adjustments To Your Amplifier: Changing the Gain.............................. 22
Looking After Your Amplifier: Maintenance ........................................................ 23
Looking After Your Amplifier: Warranty.............................................................. 23
Performance Of Your Amplifier: Specifications .................................................. 24
Performance Of Your Amplifier: Thermal Specifications.................................... 25
Appendix I: Speaker Backup Inputs..................................................................... 26
Appendix II: 70/100V line output operation .......................................................... 27
Appendix III: 70/100V line distributed audio systems .......................................... 28
Introduction................................................................................................................................. 28
How It Works............................................................................................................................... 28
Example: How many speakers can I connect to an amp channel?........................................... 29
Getting The Best Performance................................................................................................... 30
In Conclusion…............................................................................................................................ 32

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DECLARATION OF CONFORMITY
We, the manufacturer:
XTA Electronics Limited,
The Design House
Vale Business Park
Worcester Road
Stourport on Severn
Worcestershire
England
DY13 9BZ
acknowledge our responsibility that the following products:
Kind of equipment: Audio amplifier
Commodity Code: 8518408099
Type Designation: DNA20
and all OEM variants of these models
are manufactured:
in accordance with EMC Directive 2004/108/EC,
in compliance with the following norm(s) or document(s):
Technical Regulations: EN55032:2015
and
in accordance with the Low Voltage Directive 2006/95/EC,
in compliance with the following norm(s) or document(s):
Technical Regulations: EN55035:2017
Signed: ……………………………………………………………………
Name: Alex Cooper
Position: Research and Development Manager
Date: January 2019

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THANKS
Thank you for choosing an XTA DNA Series amplifier for your application.
Please spend a little time reading through Series amplifier for your application.
Please spend a little time reading through this manual, so that you obtain the best possible
performance from the unit and become familiar with its operating requirements.
All XTA products are carefully designed and engineered for cutting-edge performance and
world-class reliability. If you would like further information about this or any other MC2product,
please contact us.
We wish you many years of service from this amplifier and look forward to hearing from you in
the near future.
INTRODUCTION
The DNA Series has been designed to combine incredible audio power and performance with
ultra-flexible connectivity for both remote control and audio. Exemplary audio processing is
assured through the use of XTA’s DSP platform in the DSP enabled models (DPA Series), and
power amplifier capabilities are taken care of with high efficiency output stages and a generous
power supply.
Accepting analogue,
or optional Dante networked audio , this extra connectivity means that the
DNA Series non-DSP models can also be used in installation systems which already have a
centralized DSP core but require the flexibility of being able to pick up multiple channels of
audio from a network.
With a range of power levels available in the DNA Series, the non-DSP amplifiers can be
networked to a single DPA model, creating a powerful, efficient system that’s easy to expand
and adapt for use in live, install and everything in between.
#powermeetsprocessing

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IMPORTANT SAFETY INSTRUCTIONS
CAUTION: RISK OF ELECTRIC SHOCK.
DO NOT OPEN
WARNING: Apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing
connection.
WARNING: To prevent injury, this apparatus must be securely attached to the rack in accordance with the installation
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 the 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 two blades
with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide
blade or the third 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 by the
manufacturer.
12. Use only with the cart, 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 a tip over.
13. Unplug this apparatus during lightning storms or
when unused for a long period of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as if the 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 expose this equipment to dripping or
splashing and ensure that no objects filled with liquids,
such as vases, are placed on the equipment.
16. To completely disconnect this equipment from the
AC mains, disconnect the power cord from the mains
circuit breaker.
17. This unit is fitted with a 3-wire power cord. For
safety reasons, THE EARTH LEAD SHOULD NOT BE
DISCONNECTED IN ANY CIRCUMSTANCE.
18. Correct disposal of this product: This symbol
indicates that this product must not be disposed of with
household waste, according to the WEEE Directive
(2012/19/EU) and your national law. This product should
be taken to a collection center licensed for the recycling
of waste electrical and electronic equipment (EEE). The
mishandling of this type of waste could have a possible
negative impact on the environment and human health
due to potentially hazardous substances that are
generally associated with EEE. At the same time, your
cooperation in the correct disposal of this product will
contribute to the efficient use of natural resources. For
more information about where you can take your waste
equipment for recycling, please contact your local city
office, or your household waste collection service.
The lightning flash with arrowhead
symbol within an equilateral triangle
is intended to alert the user to the
presence 0f uninsulated “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 of important operating
and maintenance (servicing)
instructions in the literature
accompanying the appliance.

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INSTRUCTIONS DE SECURITE IMPORTANTES
ATTENTION: RISQUE DE CHOC ELECTRIQUE.
NE PAS OUVRIR
ATTENTION: Appareils de construction de CLASSE I doit être raccordé au réseau électrique via une prise de courant
reliée à la terre.
ATTENTION: Pour éviter toute blessure, cet appareil doit être solidement fixé à la torture, conformément aux
instructions d'installation.
1. Lisez ces consignes.
2. Conservez ces consignes.
3. Respectez tous les avertissements.
4. Respectez toutes les consignes d’utilisation.
5. N’utilisez jamais l’appareil à proximité d’un liquide.
6. Nettoyez l’appareil avec un chiff on sec.
7. Veillez à ne pas empêcher la bonne ventilation de
l’appareil via ses ouïes de ventilation. Respectez les
consignes du fabricant concernant l’installation de
l’appareil.
8. Ne placez pas l’appareil à proximité d’une source de
chaleur telle qu’un chauff age, une cuisinière ou tout
appareil dégageant de la chaleur (y compris un ampli de
puissance).
9. Ne supprimez jamais la sécurité des prises bipolaires
ou des prises terre. Les prises bipolaires possèdent deux
contacts de largeur diff érente. Le plus large est le contact
de sécurité. Les prises terre possèdent deux contacts plus
une mise à la terre servant de sécurité. Si la prise du bloc
d’alimentation ou du cordon d’ali-mentation fourni ne
correspond pas à celles de votre installation électrique,
faites appel à un électricien pour eff ectuer le changement
de prise.
10. Installez le cordon d’alimentation de telle façon que
personne ne puisse marcher dessus et qu’il soit protégé
d’arêtes coupantes. Assurez-vous que le cordon
d’alimentation est suffisamment protégé, notamment au
niveau de sa prise électrique et de l’endroit où il est relié à
l’appareil; cela est également valable pour une éventuelle
rallonge électrique.
11. Utilisez exclusivement des accessoires et des appareils
supplémentaires recommandés par le fabricant.
12. Utilisez exclusivement des chariots, des
diables, des présentoirs, des pieds et des surfaces de
travail recommandés par le fabricant ou livrés avec le
produit. Déplacez précautionneusement tout chariot ou
diable chargé pour éviter d’éventuelles blessures en cas
de chute.
13. Débranchez l’appareil de la tension secteur en cas
d’orage ou si l’appareil reste inutilisé pendant une longue
période de temps.
14. Les travaux d’entretien de l’appareil doivent être eff
ectués uniquement par du personnel qualifié. Aucun
entretien n’est nécessaire sauf si l’appareil est endommagé
de quelque façon que ce soit (dommages sur le cordon
d’alimentation ou la prise par exemple), si un liquide ou un
objet a pénétré à l’intérieur du châssis, si l’appareil a été
exposé à la pluie ou à l’humidité, s’il ne fonctionne pas
correctement ou à la suite d’une chute.
15. N'exposez pas cet équipement au fait de tomber goutte à
goutte ou au fait d'éclabousser et garantissez qu'aucun objet
rempli des liquides, comme les vases, n'est placé sur
l'équipement.
16. Pour complètement débrancher cet équipement de la
conduite principale de courant alternatif, débranchez la
corde de pouvoir du disjoncteur de conduite principale.
17. Cette unité est correspondue avec une corde de pouvoir
de 3 fils. Pour les raisons de sécurité, L'AVANCE DE TERRE
NE DEVRAIT ÊTRE DÉBRANCHÉE DANS AUCUNE
CIRCONSTANCE.
18. Mise au rebut appropriée de ce produit: Ce symbole
indique qu’en accord avec la directive DEEE (2012/19/EU) et
les lois en vigueur dans votre pays, ce produit ne doit pas
être jeté avec les déchets ménagers. Ce produit doit être
déposé dans un point de collecte agréé pour le recyclage des
déchets d’équipements électriques et électroniques (EEE).
Une mauvaise manipulation de ce type de déchets pourrait
avoir un impact négatif sur l’environnement et la santé à
cause des substances potentiellement dangereuses
généralement associées à ces équipements. n même temps,
votre coopération dans la mise au rebut de ce produit
contribuera à l’utilisation efficace des ressources
naturelles. Pour plus d’informations sur ’endroit où vous
pouvez déposer vos déchets d’équipements pour le
recyclage, veuillez contacter votre mairie ou votre centre
local de collecte des déchets.
Le symbole représentant un éclair fléché
dans un triangle équilatéral a pour but
d’alerter l’utilisateur de la présence
d’une “tension dangeruese” non isolée à
l’intérieur du boitier, pouvant être d’une
force suffisante pour constituer un
risqué d’électrocution.
Le point d’exclamation dans un triangle
équilatéral a pour but d’alerter
l’untilisateur de la présence d’instructions
importantes concernant le fonctionnement
et la maintenance, dans la documentation
qui accompagne l’appariel.

Page8 DNASeries—DNA20OperatingInstructions
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Installing Your Amplifier: Unpacking
After unpacking the unit, please check it carefully for any damage. If any is found, immediately
notify the carrier concerned - you, the consignee, must instigate any claim. Please retain all
packaging in case of future re-shipment.
THIS WAY UP
The Design House
Vale Business Park
Worcester Road
Stourport on Severn
Worcs.
England
Tel [phone]
Fax [phone]
Additional Symbols and Warnings
只有在高海拔地区使用不超过2000米。
Meaning of the symbol: Evaluation for apparatus only based on altitude not exceeding 2000m,
therefore it is the only operating condition applied for the equipment. There may be some potential
safety hazard if the equipment is used at altitude above 2000m.
只适合于非热带气候地区使用
Meaning of the symbol: Evaluation for the apparatus only based on temperate climate condition,
therefore it is the only operating condition applied for the equipment. There may be some potential
safety hazard if the equipment is used in tropical climate region,

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Installing Your Amplifier: Electrical Considerations
The amplifier has been manufactured to comply with your local power supply requirements, but
before connecting the unit to the supply, ensure that the voltage (printed on the rear panel) is
correct.
The amplifier is fitted with a universal power supply that operates from 90V — 260VAC.
Make sure power outlets conform to the power requirements listed on the back of the unit.
Damage caused by connecting to improper AC voltage is not covered by the warranty.
SAFETY WARNING
Where a MAINS plug or appliance coupler is used as the disconnect device, it should remain
readily operable.
Where the amplifier is mounted in a rack and permanently connected to the mains, then the
rack should be installed with a readily accessible connector or an ALL POLE circuit breaker with
3mm breaking distances.
For safety reasons,
THE EARTH LEAD SHOULD NOT BE DISCONNECTED IN ANY CIRCUMSTANCE.
If ground loops are encountered consult the section on connecting your amplifier on page 12.
The wiring colours are:
230V AREAS: EARTH = GREEN AND YELLOW
NEUTRAL=BLUE
LIVE=BROWN
DO NOT USE THE UNIT IF THE ELECTRICAL POWER CORD IS FRAYED OR BROKEN. The power
supply cords should be routed so that they are not likely to be walked on or pinched by items
placed upon or against them, paying particular attention to cords and plugs and the point where
they exit from the appliance.
ALWAYS OPERATE THE UNIT WITH THE AC GROUND WIRE CONNECTED TO THE ELECTRICAL
SYSTEM GROUND. Precautions should be taken so that the means of grounding of a piece of
equipment is not defeated.
DO NOT REMOVE THE LID. Removing the lid will expose you to potentially dangerous voltages.
There are no user serviceable parts inside.
ESD strikes to the unit’s front panel that are in excess of 4000 volts may cause disturbance to
the status LEDs on the unit. This will not affect audio performance and will be corrected on the
next power up cycle.

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Installing Your Amplifier: Mechanical Considerations
To ensure that this equipment performs to specification, it should be mounted in a suitable rack
or enclosure as described below. Like all high power amplifiers, it should be kept away from
other equipment which is sensitive to magnetic fields. Also, this amplifier may suffer a
substantial reduction in performance if it is subjected to, or mounted close to equipment which
radiates high radio frequency (RF) fields.
Warning: To prevent injury, this apparatus must be securely attached to the rack in accordance
with the installation instructions.
When mounting the amplifier in a rack or enclosure, be aware that…
THE FRONT PANEL IS NOT CAPABLE OF SUPPORTING THE UNIT ON ITS OWN.
Make sure that the rear of the unit is adequately supported. Rear bracket support holes are built
into the chassis. Brackets are available as an option.
ENSURE THERE IS ADEQUATE VENTILATION.
The cooling fans suck cool air in through the front and blow hot air out at the rear of the unit
through the ventilating grills. The front and rear of the amplifier should have free exposure to
the air (i.e. in a rack leave the front & rear doors off), with 2cm air gap at the sides.
IF AIR IS NOT ALLOWED TO ESCAPE FROM THE REAR, OVER-HEATING WILL OCCUR.
Take care when mounting other equipment in the same rack.
Make sure that the rack unit has a separate earth connection (technical earth).
Please also see the notes regarding maintenance on page 18.
Installing Your Amplifier: RF Emissions
The high frequency resonant converters in the Delta Series amplifiers have been designed to
have very low RF emissions; however, even these low-level emissions can cause interference
with other equipment.
In order for this to be minimised, the amplifier should be mounted in a metal rack enclosure,
which should have a separate (technical) Earth. Alternatively, a separate earth should be
attached to the amplifier using the rear panel earth point (see page 16).

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About Your Amplifier: Dynamic Amplifier Performance Measurements
The DNA Series are the very latest example of a ‘dynamic amplifier’. This new ‘breed’ of power
amplifiers provide very high peak power levels in a much smaller, and lighter, package than
previously possible with conventional amplifiers.
They are designed specifically for today’s high power audio installations, which use multiple
speakers with electronic crossovers or speaker controllers. These systems can handle very high
transient signals that far exceed their RMS power rating. The Delta Series amplifiers have been
designed to match this requirement and can deliver huge levels of power for short durations.
In order to protect themselves and the loudspeakers that they are driving, continuous signals
such as sine waves, are automatically detected and reduced (ramped down) to a safe level.
When trying to measure the power output however, continuous signals will give totally incorrect
results. A dynamic signal, such as a tone burst, should be used and the levels measured by
monitoring the waveform on an oscilloscope. The power envelope can then be accurately
measured.
Our power output figures are measured using signals with known Crest Factors and are quoted
at the rear of this manual on page 23 and on our website.
Please refer to the technical area of our website for further information — here you can
download a set of Crest Factor tailored audio samples to allow you to compare our specifications
with any other amplifier.

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Connecting To Your Amplifier: Line Inputs and Outputs
The inputs are made via 3-pin XLR connectors, which are electronically balanced and should be
connected via a high grade twin core screened cable, as follows:
PIN1: Screen (see note below)
PIN2: Hot (signal +)
PIN3: Cold (signal -)
The amplifier is designed to operate with fully balanced equipment and ground loops or loss of
performance may be experienced if connected to unbalanced sources. If it is unavoidable
however, the following wiring should be used. The cable should still be twin core plus screen.
PIN1: Screen - connected to the chassis of the unbalanced equipment - or left disconnected at
the unbalanced end.
PIN2: Hot (signal +)
PIN3: Cold (ground 0V)
NOTE: This amplifier is wired to the latest industry recommendations. PIN1 is connected
directly to the chassis/mains earth. If ground loops (mains hum) are encountered remove the
screen connection from the other end of the cable and leave it open circuit. If problems persist,
consult your dealer/supplier.
DO NOT TAMPER WITH OR ALTER ANY GROUND (EARTH) CONNECTIONSINSIDE THE
AMPLIFIER.
For bridged operation input should be made to channel A (or C) only and the channels set for
bridged mode for the appropriate pair of channels. Please see page 14 for details of how to do
this.
XLR
MALE

DNA Series — DNA20 Operating Instructions Page 13
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Connecting To Your Amplifier: Speaker Outputs
The speaker outputs are via Neutrik Speakon connectors. 2 pole (NL2FC) or 4 pole (NL4FC)
connectors can be used.
Pin 1+: Hot
Pin 1-: Cold
Additionally, Channel 1 Speakon connector carries Channel B2output on Pins +2 & -2 to allow
easy bi-amping or bridged operation using a single NL4 connector. Similarly, Channel 3’s
Speakon connector also carries Channel 4 output.
Output Connector 1
Pin 2+: Hot Ch. 2
Pin 2-: Cold Ch. 2
Output Connector 3
Pin 2+: Hot Ch. 4
Pin 2-: Cold Ch. 4
For bi-amped operation, connect as above.
As the currents involved are relatively high, and to ensure best performance, the speaker cables
should be kept as short as possible and conform to the following minimum requirements:
DNA20, 6A into 4 Ohm speaker loads
When operating the amplifier into loads of less than 4 Ohms, be aware that the current capacity
of the speaker cables will need to be increased above the values quoted here.
Do not connect the inputs/outputs to any other voltage source such as a battery, mains source or
power supply, regardless of whether the amplifier is turned on or off.
Do not run the output of any amplifier channel back into another channel’s input and do not
parallel or series-connect an amplifier output with any other amplifier output.
SPEAKON NL2 & NL4

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Connecting To Your Amplifier: Bridged (Mono) Operation
Pairs of channels may be independently bridged — channel pair 1+2, and/or channel pair 3+4.
The method is the same for both channel pairs:
Select the required bridged mode using the rear panel switches (see page 16 for more
information).
Use Channel 1 or 3’s Output Speakon connector and connect as follows:
Pin 2+: Hot
Pin 1-: Cold
When operating in bridged mode, the minimum impedances are doubled.
The minimum load in bridged mode is 4 ohms.

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Operating Your Amplifier: Front Panel Controls and Indicators
1: NET. AUDIO LED: This will illuminate when the selected source is the network audio
connection. To switch modes, use the rear panel switch as explained further on page 18.
2: ANALOGUE LED: This will illuminate when the selected source is the four input XLRs.
3: POWER LED: This will illuminate when mains power is connected — there is no on/off switch
on this model.
4: Signal meters: These will show the level of the respective amplifier’s output channel. The
red LED in the meter will illuminate when the limiter threshold has been reached and limiting is
occurring.
5: LINK LEDs: This indicates if the channel is linked to its immediate neighbour. The link
switches are on the rear panel — see page 16 for details. Linking is disabled in Network Audio
mode and Link LEDs will be extinguished. The front panel attenuators will still operate
independently when channels are input linked.
6: PROTECTION LED: If a condition exists, that could cause damage to either the amplifier or
the speakers, the protection circuit will disengage the outputs and this LED will illuminate/flash.
This signal is also connected to a GPO pin on the rear panel for external monitoring — see page
19 for more information. Temperature related faults will reset automatically if the unit has
cooled sufficiently.
7: BRIDGE pair LEDs: The channel pair LED will illuminate if these channels have been
switched into bridged (mono) mode. If this is illuminated, the attenuation control of the even
numbered channel (so 2 or 4) will not function as both channels are being fed from the left hand
channel. See page 14 for details of how to connect your speaker to a bridged channel pair, and
page 16 for how to enable bridge mode.
8: STANDBY LED: The power amplifiers in the Delta 20 can be powered down leaving just the
input circuitry and Dante network audio card (if fitted) active. This LED illuminates when the
power amplifier sections are turned OFF.
9: Analogue level controls: These function in both analogue input and network audio input
mode. To switch modes, use the rear panel switch as explained further on page 18.
tax
POWER
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
-12
-6
-2 0
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
ANALOGUE
NET. AUDIO
PROTECTION
BRIDGE 1+2
BRIDGE 3+4
STANDBY
DNA 20
DIGITA L NETWORK
AUDIO AMPLIFER
LI M36121824 LI M36121824 LIM36121824 LIM36121824LI NK LI NK LI NK
5
6
3
7
8
9
2
1

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Operating Your Amplifier: Rear Panel Sockets and Switches
1: Mains input: IEC 3 pin (may not be switched on some versions — fuse is then internal)
2: Channel output Speakon socket: Output 1 is on pins 1+ hot, 1- cold. Channel 2’s output is also
wired to this socket to enable a single NL4 to provide both channels and to facilitate easier
wiring in bridged mode. Channel 3’s is wired pins 1+ hot, 1- cold. Similarly channel 4’s output
Speakon socket carries Channel 4’s output wired pins 2+ hot, 2- cold. Check the legend on the
rear panel for details.
3: Audio network connections: Four additional inputs can be added to the available input
choices via the optional Dante network card.
4: Input XLR sockets: Connect signal inputs to these sockets, wired pin 2 hot, 3 cold, 1 ground.
For sensitivity and impedance of these inputs, see the specifications on page 23.
5/7: Bridged (mono) switch (1+2)/(3+4): Press this switch to run this pair of amplifier channels
in bridged mode. To run 1+2 bridged, press the switch on the far left of the panel, beside
channel A’s input XLR.
6: Link switches: Press this switch to link the input of the channel to its immediate left.
Multiple channels may be linked using these switches so, for example, to link all outputs to input
A, press all three switches IN and use input A only. The front panel attenuators will still operate
independently when channels are input linked. Linking is disabled in Network Audio mode and
Link LEDs will be extinguished.
7: See 5/7 above.
8: Source select switch: This selects either the four analogue input XLRs or the output of the
network audio card as the audio source. It operates globally across all four channels. See page
18 for more information.
9: GPIO connections: 6 way mini-Phoenix connector. The amplifier reports back its status and
can be placed into standby using these connections. See page 19 for more information.
10: Speaker Backup Inputs: These sockets can be used to connect a backup amplifier that will
automatically be switched in circuit should the main amplifier lose power, or go into “Protect”.
See Appendix I on page 26 for further information on how to use this feature.
11: Technical Earth Point: Minimise interference by earthing directly to this connection. See
page 10 for information on RF emissions.
123456
90V- 240V AC 50-60H z
BRIDGE
3+4
INPUT
LINK
BRIDGE
1+2
NC
1 - AUDIO NE TWORK - 2MAINS SUPPLY
GPIO PORT
SOURCE
SELECT
INPUT
LINK
INPUT
LINK
DESIGNED AND MANUFACTURED IN ENGLAND by XTA Electronics Ltd. and MC Audio
2
[2+/2-]
[1+/1-]
[2+/2-]
[1+/1-]
(s ee ma nu al f or d et ai ls of oper at i on )
4 123
NC NC NC
SPEAKER BACKUP
(see manual for d etails of operation)
11
10
4
5
12
6
3
789

DNA Series — DNA20 Operating Instructions Page 17
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Operating Your Amplifier: Initial Set-up and Switching On
Please read all documentation before operating your amplifier and retain all documentation for
future reference.
Do not spill water or other liquids into or on the unit and do not operate your amplifier while
standing in liquid.
Do not block fan intake or rear ventilation outlets or operate the unit in an environment that
could impede the free flow of air around the unit.
If your amplifier is used in an extremely dusty or smoky environment, it should be cleaned of any
collected debris at regular intervals. Please also see the notes regarding maintenance on page
18.
It is important that the power output of your amplifier is matched to the power handling capacity
of your loudspeaker. If not, damage to the loudspeaker could occur.
Switching On…
At ‘switch-on’ the protection circuit will initially activate whilst the circuits stabilise, indicated by
the red Protection LED illuminating, in addition to various other LEDs. After a few seconds the
red Protection LED will extinguish indicating a satisfactory working condition.
Other LEDs may remain illuminated depending upon rear panel switch settings and input
connections. If the Protection LED does not extinguish after 5 seconds the unit may be faulty or
some external connections may be incorrect or inappropriate. If this occurs, you should power
down the unit and remove all external connections (except for the mains power supply) and
repeat the power up sequence. If the problem persists please contact us — details on page 23.

Page18 DNASeries—DNA20OperatingInstructions
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Operating Your Amplifier: Switching between analogue & networked audio
Your amplifier may be fitted with a Dante network audio card, which includes 24-bit 96kHz high
performance digital to analogue converters, allowing the amplifier to use four channels chosen
from a Dante network.
As the digital audio network will most likely be running at a higher level compared to your
analogue inputs, we strongly recommend you turn the front panel attenuators to minimum
before switching modes.
To switch to network audio mode, depress the rear panel switch marked “Source Select”.
Slowly increase the levels again after the mode has been changed.
You will need to use Dante Controller to choose which channels to feed to the amplifier’s inputs.
It can be downloaded free here:
https://www.audinate.com/products/software/dante-controller
The amplifier’s inputs will appear in a manner similar to the example below:
Note that the rear panel “Link” switches do not function in Network Audio mode as any linkage
can be set up as part of the source selection within Dante Controller. Front panel “Link” LEDs
will also extinguish.

DNA Series — DNA20 Operating Instructions Page 19
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Operating Your Amplifier: General Purpose Connections (GPIO) Port
The 6-way mini-Phoenix connector on the rear panel of the DNA20 allows the amplifier to report
back to building management systems on its operating state and permits the amplifier to be
remotely switched in and out of standby.
The pins are configured as described in the table:
Port Pin # Pin Description
1 Chassis ground
2 Electrical ground (0V)
3 Standby input — short to 0V to put amplifier in standby
4 Power on — active high - +5V denotes amplifier is ON (but may be in standby)
5 Standby output — active high — +5V denotes amplifier is in standby (auto/remote/Dante)
6 Protect — active low — 0V denotes amplifier is in PROTECT

Page20 DNASeries—DNA20OperatingInstructions
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Internal Adjustments to Your Amplifier: Fixed fan speed
These instructions are for use by qualified personnel only. Before any routine maintenance,
please ensure that your amplifier is disconnected from the mains supply!
In noise sensitive environments, the auto-fan speed adjustment may be disabled. This will set
the fans to a low, less audible speed which will not vary considerably with temperature.
Please be aware that this will also therefor limit the amplifier’s ability to cool itself and so it will
instead reduce power output when high demands are placed upon it.
The feature can be enabled by soldering a link across CN24 (labelled “High Power Link”) as
shown below:
CN24 open:
Fans are fixed
low speed.
CN24 shorted:
Fans are
temperature
controlled.