MC2 Audio Delta 40 User manual

Page 2 Delta Series – Non-DSP Models Operating Instructions

Delta Series – Non-DSP Models Operating Instructions Page 3
CONTENTS
DECLARATION OF CONFORMITY........................................................................ 4
THANKS............................................................................................................... 5
INTRODUCTION................................................................................................... 5
IMPORTANT SAFETY INSTRUCTIONS ................................................................ 6
INSTRUCTIONS DE SECURITE IMPORTANTES ...................................................7
Installing Your Amplifier: Electrical Considerations......................................... 8
Installing Your Amplifier: Mechanical Considerations...................................... 9
Installing Your Amplifier: RF Emissions ........................................................... 9
About Your Amplifier: Dynamic Amplifier Performance Measurements ........ 10
Connecting To Your Amplifier: Line Inputs and Outputs...................................11
Connecting To Your Amplifier: Speaker Outputs.............................................. 12
Connecting To Your Amplifier: Bridged (Mono) Operation (excl. Delta 120) .... 13
Operating Your Amplifier: Front Panel Controls and Indicators......................14
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
Looking After Your Amplifier: Maintenance ..................................................... 19
Looking After Your Amplifier: Warranty...........................................................19
Performance Of Your Amplifier: Specifications ...............................................20
Performance Of Your Amplifier: Thermal Specifications................................. 21
Internal Adjustments To Your Amplifier: Changing the Gain...........................22
Internal Adjustments To Your Amplifier: Disabling Front Panel Gain Pots.....23

Page 4 Delta Series – Non-DSP Models Operating Instructions
DECLARATION OF CONFORMITY
We, the manufacturer:
MC2 Audio,
Units 6-8 Kingsgate
Heathpark Industrial Estate
Honiton, Devon
England
EX14 1YG
acknowledge our responsibility that the following products:
Kind of equipment: Audio amplifier
Commodity Code: 8518408099
Type Designation: Delta80DSP, Delta100DSP
Delta40S, Delta80S, Delta100S, Delta120S
T500, T1000, T1500, T2000, T3500, T4-250
Ti500, Ti1000, Ti1500, Ti2000, Ti3500, Ti4-250
E15, E25, E45, E60, E90, E100, E475
S800, S1400, D80DSP
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: EN55103-1:2009, EN55103-2:2009
and
in accordance with the Low Voltage Directive 2006/95/EC,
in compliance with the following norm(s) or document(s):
Technical Regulations: EN/IEC60065:2002 7th Edition
Signed: ……………………………………………………………………
Name: Alex Cooper
Position: Research and Development Manager
Date: January 2017

Delta Series – Non-DSP Models Operating Instructions Page 5
THANKS
Thank you for choosing a Delta 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 MC2products are carefully designed and engineered for cutting-edge performance and
world-class reliability. If you would like further information about this or any other MC2
product, 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 Delta 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, 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
Delta 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 Delta Series, the non-DSP amplifiers can be
networked to a single Delta DSP model, creating a powerful, efficient system that’s easy to
expand and adapt for use in live, install and everything in between.
#powermeetsprocessing

Page 6 Delta Series – Non-DSP Models Operating Instructions
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.

Delta Series – Non-DSP Models Operating Instructions Page 7
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.

Page 8 Delta Series – Non-DSP Models Operating Instructions
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 either a 100/120V or 220/240V tapped transformer according to
customer requirements.
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.
This unit is fitted with a 3-wire power cord.
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 11.
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.

Delta Series – Non-DSP Models Operating Instructions Page 9
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 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. The brackets which are supplied
fit standard 19 inch (483mm) rack mounting systems.
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 radio frequency (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 at the rear rack mounting bracket.

Page 10 Delta Series – Non-DSP Models Operating Instructions
About Your Amplifier: Dynamic Amplifier Performance Measurements
The Delta 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 20 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.

Delta Series – Non-DSP Models Operating Instructions Page 11
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 13 for details of how to do
this.
XLR
MALE

Page 12 Delta Series – Non-DSP Models Operating Instructions
Connecting To Your Amplifier: Speaker Outputs
For all four channel amplifiers (and excluding the Delta 120):
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.
For the Delta 120 two channel amplifier:
Bridging is NOT possible on the Delta 120. Due to the high output currents involved, each
channel’s Speakon connector uses both pairs of poles as below:
Pin 1+: Hot
Pin 1-: Cold
Pin 2+: Hot
Pin 2-: Cold
There must be no shared connections between channels.
Negative output terminals must not be joined together as they are not both at ground
potential. Connecting them together will damage the amplifier and void the warranty!
As the currents involved are very high, and to ensure best performance, the speaker cables
should be kept as short as possible and conform to the following minimum requirements:
Delta 40 NON-DSP, 11A into 4 Ohm speaker loads
Delta 80 NON-DSP, 11A into 4 Ohm speaker loads
Delta 100 NON-DSP, 11A into 4 Ohm speaker loads
Delta 120 NON-DSP, 11A into 4 Ohm speaker loads
SPEAKON NL2 & NL4
SPEAKON NL2 & NL4

Delta Series – Non-DSP Models Operating Instructions Page 13
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.
Connecting To Your Amplifier: Bridged (Mono) Operation (excl. Delta 120)
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 through the front panel MENU system (see page Error!
Bookmark not defined. 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.
Bridging is NOT possible on the Delta 120.

Page 14 Delta Series – Non-DSP Models Operating Instructions
Operating Your Amplifier: Front Panel Controls and Indicators
1: 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.
2: 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.
3: Link LED: This indicates if the channel is linked to its immediate neighbour. If this is
illuminated, the attenuation control of the channel to the immediate right will not function as
both channels are being fed from the left hand channel. The link switches are on the rear
panel — see page NN for details. Linking is disabled in Network Audio mode and Link LEDs
will be extinguished.
4: PROTECTION LED: If a condition exists, either internally or externally, that could cause
damage to either the amplifier or the speakers, the protection circuit will disengage the
outputs and this LED will illuminate/flash.
Typical conditions that could cause the protection to be triggered include very high frequency
or subsonic input signals, DC in the inputs, short-circuited outputs, or internal high
temperatures.
The protection circuit can affect all channels or a ‘channel pair’ depending on the type of
fault. This is indicated by the combination of Protection LED illuminating and a corresponding
message on the LCD. In this way, it is possible for two channels (a channel pair) to remain
functioning even though a fault has caused the other channel pair to mute. A channel pair
would be 1+2 or 3+4.
Temperature related faults will reset automatically if the unit has cooled sufficiently. Output
short circuits will require manual reset after clearing the fault (switching off at the mains
switch and then on again after a few seconds). Short circuits on either channel of a channel
pair will only affect that channel pair.
5,6: BRIDGE pair LEDs: The channel pair LED will illuminate if these channels have been
switched into bridged (mono) mode. See page 11 for details of how to connect your speaker to
a bridged channel pair, and page Error! Bookmark not defined. for how to enable bridge
mode.
7: STBY LED: The power amplifiers in the Delta 80 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.
8: Power Switch: This double pole switch turns the amplifier fully off and isolates it from the
mains supply.
PROTECTION
BRIDGE 1+2
BRIDGE 3+4
POWER
LIM
3
6
12
18
24
LIM
3
6
12
18
24
LINK
LIM
3
6
12
18
24
LIM
3
6
12
18
24
LINKLINK
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
ANALOGUE
NETWORK AUDIO
DELTA SERIES
NETWORKAUDIO POWER AMPLIFIER
STBY
2
1
3
5
6
7
8
9
10
11
4

Delta Series – Non-DSP Models Operating Instructions Page 15
8: POWER LED: This will illuminate when the Power Switch is ON. It is not an indicator of
connected supply.
9: ANALOGUE LED: This illuminates when the selected source is the four input XLRs.
10: NETWORK 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.
PROTECTION
BRIDGE 1+2
BRIDGE 3+4
POWER
LIM
3
6
12
18
24
LIM
3
6
12
18
24
LINK
LIM
3
6
12
18
24
LIM
3
6
12
18
24
LINKLINK
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
-12
-6
-20
-4
-2
0dB
ANALOGUE
NETWORK AUDIO
DELTA SERIES
NETWORKAUDIO POWER AMPLIFIER
STBY
2
1
3
5
6
7
8
9
10
11
4

Page 16 Delta Series – Non-DSP Models Operating Instructions
Operating Your Amplifier: Rear Panel Sockets and Switches
Delta 40, 80, 100 Rear Panel
Delta 120 Rear Panel
1: Fan outlet: The variable speed fans suck air in through the front vents and out through the
back of the amplifier. Please see maintenance on page 18 for recommendations on how to
clean this and the front foam sections.
2: Channel output Speakon socket: Normal output is on pins 1+ hot, 1- cold. On quad
channel amplifiers, (Delta 40, 80, 100) Channel B’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 B is wired pins 2+ hot, 2- cold. Similarly channel C’s output Speakon socket carries
Channel D’s output. Check the table on the rear panel for details.
On dual channel amplifiers (Delta 120) the second pair of pins on the Speakon carry the same
channel again for greater current delivery.
3: Audio network connections: Four (two on Delta 120) additional inputs can be added to the
available input choices via the optional Dante network card.
4: 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 (two on
a Delta 120). See page 18 for more information.
5/8: Bridged (mono) switch (3+4)/(1+2): 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. Bridging is NOT possible on the Delta 120.
6: Link switch: 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 linked. Linking is disabled in Network Audio mode
and Link LEDs will be extinguished.
7: 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 20.
All vents on front and rear of unit must not be obstructed.
Tous l es p assag es su r avant et ar r i èr e d e l'un i t é ne doiv ent p as être ob st r u és.
SERIAL NO.
OUTPUT
Cl ass 3 W i r ing
on Ou tp u t s
1 - AUDIO NE TWORK - 2
DES IGNED AN D
MANUFACTURED
IN EN GLAN D BY
SERIES
OUTPUTOUTPUTOUTPUT
OUTPUT WIRING
CONNECTORS
BRID GE
1+
1-
2+
2-
PIN NUMBER
BRIDGE
3+4
BRIDGE
1+2
INPUT
LINK
INPUT
LINK
INPUT
LINK
SOURCE
SELECT
4 5
1
2
6
3
7
8
All vents on front and rear of unit must not be obstructed.
Tous l es p assag es su r avant et arr i èr e d e l' u n i té ne d oi ven t pas êt r e obst r u és.
SERIAL NO.
OUTPUT
Class 3 Wiring
on Ou tp u t s
1 - AUDIO NETWORK - 2
DES IGNED AN D
MANUFACTURED
IN EN GLAN D BY
SERIES
OUTPUT
INPUT
LINK
SOURCE
SELECT
OUTPUT WIRING
CONNECTORS
1+
1-
2+
2-
PIN N UM BER
Class 3 Wiring
on Outp u t s
4
1
2
6
3
7

Delta Series – Non-DSP Models Operating Instructions Page 17
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 19.

Page 18 Delta Series – Non-DSP Models Operating Instructions
Operating Your Amplifier: Switching between analogue & networked audio
Your amplifier may be fitted with a Dante network audio cord, which includes 24-bit 96kHz
high performance analogue to digital 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.

Delta Series – Non-DSP Models Operating Instructions Page 19
Looking After Your Amplifier: Maintenance
These maintenance instructions are for use by qualified personnel only. Before any routine
maintenance, please ensure that your amplifier is disconnected from the mains supply!
The filter behind the air intake apertures on the front of your amplifier should be cleaned or
replaced periodically, e.g. 3 -6 months. (Filters in amplifiers located in more 'dirty'
atmospheres may require more frequent maintenance).
The filter should be 'dry' cleaned, using a vacuum cleaner preferably. Running the unit
without a filter is not recommended. We recommend replacement of filters every 2-3 years,
depending on usage. Replacement filter material is available directly from us.
If the fan vents on the rear of the amplifier develop a build-up of dust/debris on the finger
guards, they can be cleaned with a dry paintbrush and a vacuum cleaner.
The casework of the amplifier may be cleaned with a lightly dampened cloth — do not use any
solvents as they will damage the paint finish and could remove printing.
If you have any doubts about carrying out maintenance, please refer to a service engineer or
contact your local dealer.
Looking After Your Amplifier: Warranty
Your amplifier is guaranteed for a period of five (5) years from the date of manufacture.
Please note that this does not apply to OEM versions of the amplifier — please consult your
manufacturer for their warranty terms. We hope that it gives you many more years of reliable
service than this, but should anything go wrong, please contact us to advise you about repairs
or any spares you might require.
Please do not attempt to repair the amplifier yourself as doing so will invalidate the warranty.
Our contact details are:
MC2Audio,
Units 6-8 Kingsgate
Heathpark Industrial Estate
Honiton, Devon
England
EX14 1YG
Tel: [phone]
Fax: [phone]
email: [email protected]k for general enquiries
Our website is a great place to get started if you have any questions regarding the general use
of your amplifier or need copies of this manual in digital form, or datasheets and
photographs. The datasheets also contain architect’s and engineer’s specifications.
www.mc2-audio.co.uk

Page 20 Delta Series – Non-DSP Models Operating Instructions
Performance Of Your Amplifier: Specifications
Main Specifications
Parameter (Units) Delta 40 Delta 80 Delta 100 Delta 120
Output Power per channel [Crest Factor = 4.8] (Watts)
8 Ohms 540 975 1500 2400
4 Ohms 1000 1800 2800 4800
2.7 Ohms 1200 2300 3700 6200
Output Power per channel bridged [Crest Factor = 4.8]
(Watts)
8 Ohms 2000 4000 5600 ---
THD+N, 4 Ohms (%)
@1kHz, 1dB below max output power <0.08 0.08 0.08 0.08
@20Hz - 20kHz, 1dB below max output power <0.1 0.1 0.1 0.1
Gain Options (dB) 26/32 26/32 26/32 26/32
Sensitivity Options for max power (dBu) 6.23 8.79 10.7 13
Sensitivity Options for max power (Volts) 1.59 2.13 2.66 3.48
Frequency Response, +0/0.5dB (Hz) 20 — 20000 20 — 20000 20 — 20000 20 — 20000
Power Consumption, Nominal @ 240V, 4 Ohms (A) 2.9 5.0 7.5 6.4
Power Consumption, Nominal @ 120V, 4 Ohms (A) 6 10.4 15.5 13.2
Dimensions H x W x D (mm)
Amplifier 88 x 482 x
428
88 x 482 x
428
88 x 482 x
428
88 x 482 x
428
Boxed 230 x 580 x
560
230 x 580 x
560
230 x 580 x
560
230 x 580 x
560
Boxed Shipping — all except UK 250 x 610 x
600
250 x 610 x
600
250 x 610 x
600
250 x 610 x
600
Weight (kgs)
Amplifier 10.0 11.0 12.5 12.25
Boxed — shipping 12.0 13.0 14.5 14.25
Additional Specifications
Parameter (Units) Delta 40 Delta 80 Delta 100 Delta 120
Input Impedance — Active Balanced (Ohms) 20k 20k 20k 20k
Input CMRR (dB) > 60 > 60 > 60 > 60
Damping Factor, 1kHz, 8 ohms > 400 > 400 > 400 > 400
Signal Limiters Present Yes Yes Yes Yes
Protection Present — Short Circuit / DC Output /
Temperature
Yes Yes Yes Yes
Mains In-rush Control Present Yes Yes Yes Yes
Output Power per channel, 8 Ohms (Watts)
Continuous music [Crest Factor of 2.8 or 9dB] 525 950 1460 2350
Continuous music [Crest Factor of 4.8 or 14dB] 540 975 1500 2400
Continuous music [Crest Factor of 7.8 or 18dB] 555 1000 1540 2450
Output Power per channel, 4 Ohms (Watts)
Continuous music [Crest Factor of 2.8 or 9dB] 970 1850 2720 4700
Continuous music [Crest Factor of 4.8 or 14dB] 1000 1900 2800 4800
Continuous music [Crest Factor of 7.8 or 18dB] 1030 1950 2880 4900
Output Power per channel, 2.7 Ohms (Watts)
Continuous music with Crest Factor of 2.8 [9dB] 1170 2050 3600 6000
Continuous music with Crest Factor of 4.8 [14dB] 1200 2100 3700 6200
Continuous music with Crest Factor of 7.8 [18dB] 1230 2150 3880 6300
Due to continuing product improvement, the above specifications are subject to change.