MC2 Audio E15 User manual

E Series
Lightweight Touring Power Amplifiers
MC
E15 & E25
Operating Instructions
MC
www.mc2-audio.co.uk
T
el. [phone] Fax. [phone]
MC AUDIO | Units 6-8 Kingsgate | Heathpark Industrial Estate
Honiton | Devon | England | EX14 1YG
2

Page 2 E Series – E15 & E25 Operating Instructions

E Series – E15 & E25 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: Inputs................................................................11
Connecting To Your Amplifier: Speaker Outputs.............................................. 12
Connecting To Your Amplifier: Bridged (Mono) Operation............................... 13
Operating Your Amplifier: Front Panel Controls and Indicators......................14
Operating Your Amplifier: Notes and Switching On ......................................... 15
Operating Your Amplifier: Rear Panel Sockets and Switches .........................16
Looking After Your Amplifier: Maintenance ..................................................... 17
Looking After Your Amplifier: Warranty........................................................... 17
Changing the Gain of Your Amplifier: Internal Adjustments!...........................18
Performance Of Your Amplifier: Specifications ...............................................19

Page 4 E Series – E15 & E25 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: 8518408990
Type Designation: T500, T1000, T1500, T2000, T3500, T4-250
Ti500, Ti1000, Ti1500, Ti2000, Ti3500, Ti4-250
E15, E25, E45, E90, E100, E475
S800, S1400
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: EN55103-1:1996, EN55103-2:1996
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 2012

E Series – E15 & E25 Operating Instructions Page 5
THANKS
Thank you for choosing an E 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
These lightweight, modified class AB amplifier have been designed to the same high
standards of reliability and sound quality that our customers have come to expect of all MC2
audio products.
As with all E Series amplifiers, the E15 and E25 will deliver their rated power over the entire
audio bandwidth, and a resonant switchmode power supply with a large reservoir gives
extremely high peak power without any “bass sag”.
Optical limiters keep mains input and output currents within a safe operating area at all
times, whilst maintaining transparent sonic performance.
Power Reduction Circuitry (PRC) controls on the rear panel, linked to the limiter thresholds,
allow each channel to be independently set so that different speakers can be safely
connected to each channel.
Running cool in even the most difficult conditions, the E15 can deliver over 850W(E25: 1300W)
into 4 ohms with both channels driven, and an impressive 3100W (4R) bridged (E25: 4800W),
with outstanding distortion and noise figures right up to maximum output.
The amplifier, of course, includes full DC, VHF, thermal and short circuit protection to ensure
continuous trouble-free service.

Page 6 E Series – E15 & E25 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.
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with a dry cloth.
Do not block any ventilation openings, install in
accordance with the manufacturer’s instructions.
Do not install near any heat sources, such as
radiators, heat registers, stoves or other apparatus
(including amplifiers) that produce heat.
Protect the power cord from being walked on or
pinched particularly at plugs, convenience
receptacles and the pint where they exit from the
apparatus.
The mains circuit breaker shall remain readily
accessible.
Only use attachments/accessories specified by the
manufacturer.
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.
Disconnect this apparatus during lightning storms or
when unused for a long period of time.
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.
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.
To completely disconnect this equipment from the AC
mains, disconnect the power cord from the mains circuit
breaker.
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.
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 and rear doors off), with 2cm air gap at the
sides and top. IF AIR IS NOT ALLOWED TO ESCAPE
FROM THE REAR, OVER-HEATING WILL OCCUR. Take
care when mounting other equipment in the same rack.
The mains switch on the amplifiers only switches one
pole of the mains supply, therefore for units with a
detachable cord to be fully disconnected from the
mains, the mains disconnect device (ie mains plug or
mains coupler) should remain readily operable. For
units with a fixed mains lead the external all pole circuit
breaker with 3mm breaking distances is the disconnect
device and therefore the installation of the amplifier
shall be carried out in accordance with all the applicable
installation rules.
The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert the user to the presence
if 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 point within an
equilateral triangle is intended to alert
the user of important operating and
maintenance (servicing) instructions in
the literature accompanying the
appliance.

E Series – E15 & E25 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.
Lisez ces instructions.
Gardez ces instructions.
Faites attention à tous les avertissements.
Suivez toutes les instructions.
N'utilisez pas cet appareil près de l'eau.
Faites le ménage seulement avec un tissu sec.
Ne bloquez pas d'ouvertures de ventilation, installez
conformément aux instructions du fabricant.
N'installez près d'aucunes sources de chaleur,
comme les radiateurs, les registres de chaleur, les
cuisinières ou d'autre appareil (en incluant des
amplificateurs) qui produisent la chaleur.
Protégez la corde de pouvoir d'être marché sur ou
pincé particulièrement aux prises de courant, les
réceptacles d'avantage et la pinte où ils sortent de
l'appareil.
Le disjoncteur de conduite principale restera sans
hésiter accessible.
Utilisez seulement des attachements/accessoires
spécifiés par le fabricant.
Utilisez seulement avec le chariot, le trépied, la
parenthèse ou la table spécifiée par le fabricant, ou
vendu avec l'appareil. Quand un chariot est utilisé,
utilisez la prudence en déplaçant la combinaison de
chariot/appareil pour éviter la blessure d'un bout.
Débranchez cet appareil pendant les tempêtes de
foudre ou quand neuf pendant un long terme de
temps.
Renvoyez tout l'entretien au personnel de service
qualifié. L'entretien est exigé quand l'appareil a été
nui de toute façon, comme si la corde de pouvoir
provision ou la prise de courant sont nuis, le liquide a
été déversé ou les objets sont tombés dans l'appareil,
l'appareil a été exposé pour pleuvoir ou l'humidité,
n'opère pas normalement, ou a été baissé.
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.
Pour complètement débrancher cet équipement de la
conduite principale de courant alternatif, débranchez la
corde de pouvoir du disjoncteur de conduite principale.
Où l'amplificateur est monté dans un égouttoir et en
permanence raccordé à la conduite principale, alors
l'égouttoir devrait être installé avec un connecteur sans
hésiter accessible ou TOUT le disjoncteur de PÔLE avec
3 millimètres cassant des distances.
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.
Les ventilateurs engloutissent l'air frais par le front et
soufflent l'air chaud à l'arrière de l'unité par les grils
aérants. Le front et l'arrière de l'amplificateur devraient
avoir l'exposition libre à l'air (c'est-à-dire dans un
égouttoir omettent les portes de devant et arrière), avec
le trou aérien de 2 centimètres aux côtés et au haut. Si
on NE PERMET PAS QUE D'AIR S'ÉCHAPPE DE
L'ARRIÈRE, LE FAIT DE SURCHAUFFER SE PRODUIRA.
Faites attention en montant d'autre équipement dans le
même égouttoir.
L'interrupteur principal sur les amplificateurs ne coupe
qu'un pôle de l'alimentation secteur. le cordon IEC
permettra de déconnecter l'appareil de l'alimentation
secteur, pour cette raison l'accès à ces fiches (fiche
mâle ou femelle) doit être facilités.
Pour les appareils avec un câble d'alimentation fixe
sans fiche secteur, le dispositif de coupure omnipolaire
ayant une distance d'ouverture de contact d'au moins
3mm, sera le dispositif permettant la déconnexion
complète de l'appareil.
Pour cette raison l'installation et le raccordement de
l'amplificateur devra ce faire conformément au
réglementation en vigueur.
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 E Series – E15 & E25 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 an adjustable 100/120V to 220/240V tapped transformer according
to customer requirements. Please note that adjustment of mains operating voltage requires
other component changes and must be undertaken by qualified service personnel only.
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 120V AREAS: EARTH = GREEN
NEUTRAL=BLUE NEUTRAL=WHITE
LIVE = BROWN LIVE = BLACK
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.

E Series – E15 & E25 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 17.
Installing Your Amplifier: RF Emissions
The high frequency resonant converters in the E 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 E Series – E15 & E25 Operating Instructions
About Your Amplifier: Dynamic Amplifier Performance Measurements
The E15 and E25 are modern examples 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 E 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 and on our website.
Please refer to the Technical Support area of our website for further information.

E Series – E15 & E25 Operating Instructions Page 11
Connecting To Your Amplifier: Inputs
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)
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.
XLR
MALE

Page 12 E Series – E15 & E25 Operating Instructions
Connecting To Your Amplifier: Speaker Outputs
The speaker outputs are via Neutrik Speakon connectors. 2 pole (NL2FC) connectors can be
used, but 4 pole (NL4FC) connectors should be used to connect to the bridge/stereo 4 pole
output socket.
Channel A/B outputs:
Pin 1+: Hot
Pin 1-: Cold
Bridge/Stereo output:
Pin 1+: Ch. A Hot
Pin 1-: Ch. A Cold
Pin2+:Ch.BHot
Pin 2-: Ch. B 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:
E15, 14A into 4 Ohm speaker loads
E25, 16A 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.
For details of bridged operation please see overleaf — there are important differences in
connections and cable specifications!
SPEAKON NL2 & NL4

E Series – E15 & E25 Operating Instructions Page 13
Connecting To Your Amplifier: Bridged (Mono) Operation
Use the centre Speakon connector marked Bridge/Stereo, and depress the button between
the XLR connectors to the “Channel Link [A]” position.
Connect the speaker as follows: Pin 1-: Cold (A)
Pin2+:Hot(B)
When operating in bridged more, the minimum impedances are doubled.
The minimum load in bridged mode is 4 Ohms.

Page 14 E Series – E15 & E25 Operating Instructions
Operating Your Amplifier: Front Panel Controls and Indicators
1: Power Switch: This single pole switch turns the amplifier fully off (but does NOT isolate it
from the mains supply).
2: Power LED: This indicates when the amplifier is active. This does NOT indicate the
presence of a mains supply when the power switch is OFF.
3: Signal Meter and OCM indicators: These LED bar graphs show instantaneous level on
each channel to indicate proximity to the limiter threshold. Note that if the PRC system is in
operation on any channel, this will affect the readout shown on the respective meter.
The red LED in the meter will illuminate when the limiter threshold has been reached and
limiting is occurring. The output current monitor (OCM) may activate to limit the output
current of the amplifier channel - this can occur even if the amplifier has not reached clipping
point.
The OCM indicator can operate independently of the bar graph meter. Typical conditions that
may trigger the OCM circuitry would be very low load impedance, or high subsonic or VHF
levels.
4: Attenuation Controls: These are analogue controls allowing precise level settings. Note
that in linked mode some controls may be inactive.
5: Link LED: This indicates if the channels are linked together. If this is illuminated, the
attenuation control and meter of channel B not function as both channels are being fed from
channel A’s control. The link switch is on the rear panel — see page 16 for details.
6: PRC LED: This illuminates if the Power Reduction Control has been enabled on the
respective channel. PRC switches are on the rear panel — see page 16 for details.
7: A/P (Auto Protect) 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 the A/P LED will illuminate. The amplifier will continue to be monitored and
depending on the type of fault, will either reset after the fault has cleared or require manual
resetting by switching off at the mains switch and then on again after a few seconds.

E Series – E15 & E25 Operating Instructions Page 15
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 both channels or an individual channel, depending on the
type of fault. This is indicated by the combination of A/P LED and OCM LED illuminating.
Temperature related faults will reset if the unit has cooled sufficiently.
Output short circuits will require manual reset after clearing the fault. A/P will illuminate
together with the OCM LED on the shorted channel.
Operating Your Amplifier: Notes and Switching On
Read all documentation before operating your equipment and retain all documentation for
future reference.
Do not spill water or other liquids into or on the unit and do not operate the unit 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 the unit 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 17.
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 A/P LED illuminating, in addition to various other LEDs. After a few seconds the red
A/P LED will extinguish indicating a satisfactory working condition.
Other LEDs may remain illuminated depending upon rear panel switch settings and input
connections. If the A/P 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 17.

Page 16 E Series – E15 & E25 Operating Instructions
Operating Your Amplifier: Rear Panel Sockets and Switches
1: Channel A output Speakon socket: Output is wired pins 1+: hot, 1-: cold.
Similarly channel B’s output Speakon socket uses two poles wired as above.
2: Bridge/Stereo output Speakon socket: Output of both channels are available on this centre
socket. It is wired pins 1+: Ch. A hot, 1-: Ch. A cold, 2+: Ch. B hot, 2-: Ch. B cold. For details of
how to connect a speaker in bridge mode, see page 13.
3: Link switch: Press this switch to link the input of the channel A to both channels. Once
linked, only channel A’s attenuator and meter will function.
4: Link XLR Socket: This socket is wired in parallel with its respective input socket to allow
the input signal to be linked out to further amplifiers. It is a passive connection so it will
function even when the amplifier is switched off.
5: Input XLR sockets: Connect signal inputs to these sockets, wired pin 2 hot, 3 cold, 1
ground. For sensitivity and impedance of these inputs, please see the specifications on page
18.
6: PRC switches: Each channel of the amplifier may be power limited independently using
these pairs of switches in three stages, offering 2, 4 and 6dB of Power Reduction Control.
The settings for these switches are on the rear panel for quick reference. Please refer to the
power specifications on page 20 for more information on actual power reduction levels.
7: 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 17 for recommendations on how to
clean this and the front foam sections.
P.R.C. S1 S2
Power
Reduction
Control
0dB
-2dB
-4dB
-6dB
SERIALNO.
1:GND
2:Sig+
3:Sig-
WARNINGS
All vents on front
andrearofunit
must not be
obstructed.
SHOCK
HAZARD
Do not remove
covers.
Toreducetherisk
of fire or electric
shock, do not
expose this
apparatusto
rain or moisture.
Thisunitmustbe
earthed.
CHANNEL B
OUT CHANNEL A OUT
Class 2 Wiring
onOutputs
Channel A/B Out puts
Bridge/StereoOutput
1+:HOT
1-:COLD
For Stereo Use
1+: Ch.A HOT, 1- Ch.A COLD
2+: Ch.B HOT, 2-, Ch.B COLD
For Bridge Use
2+: HOT, 1-: COLD
P.R.C. S1
Power
Reduction
Control
0dB
-2dB
-4dB
-6dB
S2 Channel
Link[A]
Stereo
P.R.C.S1 S2
BRIDGE/STEREO
OUT
E-SERIES
AMPLIFICATION
DESIGNEDAND
MANUFACTURED
IN ENGLAND BY
MC
2
1
6
5
4
7
2
3

E Series – E15 & E25 Operating Instructions Page 17
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 18 E Series – E15 & E25 Operating Instructions
Changing the Gain of Your Amplifier: Internal Adjustments!
These instructions are for use by qualified personnel only. Before any routine maintenance,
please ensure that your amplifier is disconnected from the mains supply!
Gain/Sensitivity Settings
The voltage gain of the amplifier can be selected to be either +32dB (standard) or +26dB or a
fixed sensitivity of +6dBu input level* to match system sensitivity as required. This is achieved
by setting links on the input board internally.
After removing the lid and with the rear panel facing away from you, locate the input circuit
board as shown below – it is attached to the input XLR connectors. Find the sets of links as
marked by the arrows, and move them as shown to set the gain as required. Number 1
adjusts channel A’s gain, and number 2 adjusts channel B’s gain.
Remember, setting higher gain does not change the maximum available power but changes
the level of signal input to achieve maximum power. In any case, provided that the input
signal is less than 20dBu/7.7V, the built in limiter circuit will prevent distortion within the
amplifier.
The gain should be set to match the signal level from the source — mixer, equaliser etc.
*Equivalent gain for the fixed sensitivity setting is 31dB (E25:33dB).
Link
26dB
Gain
3&4
15
Gain A
15
Gain B
12
Link
32dB
Gain
(default)
1&2
Fixed Sensitivity Setting: +6dBu (1.5V)
Link
(33dB
Gain)
2&3
Link
(31dB
Gain)
4&5
E15 E25
E15 & E25

E Series – E15 & E25 Operating Instructions Page 19
Performance Of Your Amplifier: Specifications
Main Specifications
Parameter (Units) E15 E25
Output Power per channel [Crest Factor = 4.8] (Watts)
8 Ohms 450 700
4 Ohms 850 1350
2 Ohms 1550 2400
Output Power per channel bridged [Crest Factor = 4.8] (Watts)
8 Ohms 1700 2700
4 Ohms 3100 4800
THD+N, 4 Ohms (%)
@1kHz, 1dB below max output power <0.008 0.008
@20Hz - 20kHz, 1dB below max output power <0.03 0.03
Gain Options (dB) 26 / 31 / 32 26 / 32 / 33
Sensitivity Options for max power (dBu) 11.0 / 6.0 / 5.0 13.0 / 7.0 / 6.0
Sensitivity Options for max power (Volts) 2.7 / 1.5 / 1.4 3.5 / 1.7 / 1.5
Frequency Response, +0/0.3dB (Hz) 20 — 20000 20 — 20000
Power Consumption, Nominal @ 240V, 4 Ohms (A) 2.1 3.0
Power Consumption, Nominal @ 120V, 4 Ohms (A) 4.2 6.0
Dimensions H x W x D (mm)
Amplifier 88 x 482 x 428 88 x 482 x 428
Boxed 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
Weight (kgs)
Amplifier 9.8 10.2
Boxed — shipping 11.6 11.9
Additional Specifications
Parameter (Units) E15 E25
Input Impedance — Active Balanced (Ohms) 20k 20k
Input CMRR (dB) > 60 > 60
SNR (dB) 105 105
Damping Factor, 1kHz, 8 ohms > 400 > 400
Signal Limiters Present Yes Yes
Protection Present — Short Circuit / DC Output / Temperature Yes Yes
Mains In-rush Control Present Yes Yes
Output Power per channel, 8 Ohms (Watts)
Sine Wave @ 1kHz 400 650
Continuous music [Crest Factor of 2.8 or 9dB] 425 675
Continuous music [Crest Factor of 4.8 or 14dB] 450 700
Continuous music [Crest Factor of 7.8 or 18dB] 475 725
Output Power per channel, 4 Ohms (Watts)
Sine Wave @ 1kHz 775 1200
Continuous music [Crest Factor of 2.8 or 9dB] 825 1250
Continuous music [Crest Factor of 4.8 or 14dB] 850 1350
Continuous music [Crest Factor of 7.8 or 18dB] 875 1350
Output Power per channel, 2 Ohms (Watts)
Sine Wave @ 1kHz 1350 2200
Continuous music with Crest Factor of 2.8 [9dB] 1500 2300
Continuous music with Crest Factor of 4.8 [14dB] 1550 2400
Continuous music with Crest Factor of 7.8 [18dB] 1600 2600
Due to continuing product improvement the above specifications are subject to change.

Page 20 E Series – E15 & E25 Operating Instructions
Performance Of Your Amplifier: Specifications
Power Consumption and Thermal Emissions — E15
Mains
(V)
Load
(R)
Current Draw
(A)
Thermal Emissions
(W)
No Sig’l Light Average Heavy No Sig’l Light Average Heavy
240 8 0.6 0.9 1.4 2.6 144 162 190 261
240 4 0.6 1.1 2.1 4.4 144 176 230 371
240 2 0.6 1.6 3.2 6.9 144 203 301 515
120 8 1.2 1.8 2.7 5.1 144 162 190 261
120 4 1.2 2.3 4.1 8.8 144 176 230 371
120 2 1.2 3.2 6.5 13.7 144 203 301 515
Power Consumption and Thermal Emissions — E25
Mains
(V)
Load
(R)
Current Draw
(A)
Thermal Emissions
(W)
No Sig’l Light Average Heavy No Sig’l Light Average Heavy
240 8 0.7 1.2 1.9 3.8 168 195 239 354
240 4 0.7 1.5 3.0 6.5 168 218 305 512
240 2 0.7 4.8 4.8 11.3 168 264 411 801
120 8 1.4 2.3 7.7 7.7 168 195 239 354
120 4 1.4 3.1 13.0 13.0 168 218 305 512
120 2 1.4 4.6 22.7 22.7 168 264 411 801
No Sig’l = Quiescent, Light = Crest Factor of 7.8(18dB),
Average = Crest Factor of 4.8(14dB), Heavy = Crest Factor of 2.8(9dB)
For details of measurement methods please refer to the Technical Support area of our website.
PRC Settings and Maximum Output
Power Reduction Control
Setting
Per Channel
E15
Bridged Pair
E15
Per Channel
E25
Bridged Pair
E25
Maximum Power into 8 ohms (W) 450 1700 700 2700
-2dB PRC 283 1100 440 1700
-4dB PRC 180 680 280 1100
-6dB PRC 110 430 180 680
Maximum Power into 4 ohms (W) 850 3100 1350 4800
-2dB PRC 540 1960 850 3000
-4dB PRC 340 1230 540 1900
-6dB PRC 210 780 340 1200
Maximum Power into 2 ohms (W) 1550 N/A 2400 N/A
-2dB PRC 980 N/A 1510 N/A
-4dB PRC 620 N/A 960 N/A
-6dB PRC 390 N/A 600 N/A