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Power Amplifier
Operating Manual
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Read these instructions-All the safety and operating instruction should be read before the product is operated.
Keep these instructions- The safety and operating instruction should be retained for future reference.
Heed all warnings-All warning on the product and in the operating instructions should be adhered to.
Follow all instructions-All operating and use instructions should be followed.
Do not use this apparatus near water.
Mains powered apparatus shall not be exposed to dripping or splashing and that no ojects lled with liquids such as
vases, shall be placed on the apparatus.
Clean only with 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 ampliers)
that produce heat.
Do not defeat the safety purpose of the polarized or grounding-type plug. Apolarized 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 t into your outlet, consult an electrician for
replacement of the obsolete outlet. (for U.S.A. and Canada)
Protect the power cord from beign walked on or pinched particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
Only use attachments / accessories specied by the manufacturer.
Unplug this apparatus during lightning storms or when unused for long periods of time.
Refer all servicing to qualied service personnel. Servicing is required when the apparatus
has been damaged in any way, such as power-supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
Do not install this equipment on the far position from wall outlet and / or convenience
receptacle.
Do not install this equipment in a confined space such as a box for the conveyance or
similar unit.
Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
or sold with the apparatus. When a cart is used, use caution when moving the cart /
apparatus combination to avoid injury from tip-voer.
1.Outdoor Use and Wet Location Warning.
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS
PRODUCT TO RAIN OR MOISTURE.
2.Protective Earthing Connection Warning.
WARNING-This apparatus shall be connected to a mains socket outlet with a
protective earthing connection.
3.Caution Marking Explanation
The terminals marked with the symbol are hazardous live, and the external wiring connected to these terminals
requires installation by an instructed person or the use of ready-made leads or cords.
The lightning ash with arrowhead symbol within an equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufcient magnitude
to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to aiert the user to the presence of important
operating and maintenance (servicing) instructions in the literature accompanying the product.
4.Disconnection From the Mains Statement
Install this product near the wall socket and keep the power plug easily accessible.
5.Caution
These servicing instructions are for use by qualied service personnel only. To reduce the risks of electric shock do not
perform any servicing other than that contained in the operating instructions unless you are qualied to do so.
IMPORTANT SAFETY INSTRUCTIONS
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POWER AMPLIFIER
1
The WHARFEDALE Wireless Works was established
in 19 32 by Gilb er t Briggs who soon e stablished
a r eput a t ion as on e o f th e m ost inn o vati v e
lou dsp eak er en gin eer s o f his gene rat ion . H is
company was at the leading edge of on exciting
new technology which was dedicated to bringing
th e pleasure of m usic and enterta in ment i nto
people’s h omes. As the techn ology adva nced
Wharfedale gave many music lovers their rst taste
of High Fidelity, mounting a s eries of live sound
demonstrations which excited the audio world and
heralded the birth of the modern hi- loudspeaker.
T o d a y W h a r f e da l e P ro t a k e s t h e s a m e
un co mp romising appro ac h to the d es ig n an d
ma nufac turin g of eve ry aud io pro duct, u sing
hi gh-qu al ity com po nents a nd s tate- of -the- art
testing equipment to ensure consistency and high
performance. At Wharfedale we design and build
all of our products. We control all the variables,
so that we don’t have to compromise our design
goals.
Wharfedale Pro MP Series of Professional Power
Amplifiers are high quality amplifiers suitable for
stage, club and studio use. Using proven circuitry
they are straightforward to use, reliable in operation
and capable of excellent performance.
Wharfedale Pro MP Series of Professional Power
Ampliers
Over engineered power supplies with substantial
high current transformers.
Fully Protected Circuitry: Protection for thermal
Runaway ; output sh ort c ircuits ; DC voltag es;
switch on/off transients and input overload.
Co ol Runn in g: A c omb inati on of a massi ve
extruded aluminium heat sink and variable speed
fan ensures effective cooling.
Over Engineered Design: From the strong steel
case through the thick multi layer circuit boards
to the ar ray of po wer transis tors, Wharfedale
have built in a healthy safety margin.
Modern manufacturing techniques and value
engineered design.
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Unpacking
A l l W h a r f e d a l e P r o
products are fully checked
before leaving the factory.
Af ter unpac king ple ase
inspect contents for any
physical damage. Please
retain the shipping carton
if Possible and internal packing material in case the
unit needs to be returned. Please check as soon
as possible the unit is functioning correctly. In the
event of any damage please contact your dealer
immediately so that a written claim for damages
can be made.
Wharfedale Pro Limited Warranty
Wharfedale Pro MP Series Powe r Ampl ifiers are
warranted to be clear of defects in construction,
materials and malfunction under normal operating
conditions. Wharfedale will, during the warranty,
and its own discretion, undertake to make repairs
at no charge if the product has been delivered
to Wh arfe dale Pro by a Whar f eda l e D eal e r.
Wharfedale exclude normal exterior wear to finish
and cannot be held responsible for any system
malfunction due to abuse or using the units beyond
th e limit s and con ditio ns as st ate d wi thi n th e
specified ratings. Wharfedale shall not be liable
fo r any con seque ntial d am ages. A ny imp lied
warranties expire after the given term.
This warranty is only valid providing:
I) Warranty applies to or iginal purchaser only
(warranty not transferable)
II) Warranty card must be lled in fully and returned
to Wharfed ale Pro within 30 days from date of
purchase. Failure to do will not affect your statutory
rights.
III) Unit must be returned with original sales receipt
or other proof of purchase.
IV) Unit is repaired by Wharfedale or authorized
service agent only.
These terms do not infringe your statutory rights.
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POWER AMPLIFIER
2
PLEASE READ IMPORTANT INSTRUCTIONS
BEFORE USING THE AMPLIFIERS! SAFETY
INSTRUCTIONS
To reduce the risk of electric shock the user should
not remove the cover. All operating and safety
instructions should be fillowed. The unit should be
kept clear of water, uids and moisture and not be
operated in damp conditions. The unit should be
operated in a well ventilated environment. The unit
should be kept away from excessive heat sources
such as radiators and if racked with other power
amplifiers there should be a free air flow to vent
out the heat produced check with (dealer). The
unit must only be connected to a power supply as
shown on the rear of the unit with the IEC cable (or
similar) provided with precaution taken to make
sure that the grounding (earthing) or prolarisation
is i n place and n ot in defeat mod e (ie. Ear th
disconnected). The power cord must be situated
or routed so as not to be walked upon or pinched
or objects placed upon it with special attention to
the area where the power cable enters the unit.
The power cable should be disconnected during
prolonged non usage. The user should not attempt
to service the unit or do anything to the unit except
those things described in this manual. For service
and repair your dealer should be contacted. This
unit complies with the relevant safety regulations.
POWER NOTICE FOR SAFETY
All british and European countries have a nominal
23 0v m ains pow er sup pl y which in pra ctice is
be tw ee n 220 V and 240V. In t he USA th e main
power supply is nominally 115V and in Japan 100V.
This unit is factory set to the correct voltage and
this can be checked by looking at the label on the
rear panel near the power cable. If the unit is to
be used in a country other than that if was shipped
to consult your dealer. The unit is suitable for use
with mains frequencies of 50-60Hz. As there are no
user serviceable components inside the amplifier,
and high voltages are present, DO NOT remove
the covers! Be sure to make all audio connections
to the amplifier before connecting to the mains
supply. Do not disconnect the amplifier from the
grounded equipment with the mains connector still
plugged into the mains supply. Important warning!
This Unit MustBe Grounded, Do not Disconnect the
Ground Connection! Any sound system should be
connected to ground at one point only. If there is
more than one Connection to earth, a GROUND
LOOP can be formed, which allows mains hum to
enter the circuitry, sometimes at a high level. If hum
occurs in the system consult your dealer.
APPLICATION
The new Mp rang e o f p owe r a m pli fier s f rom
Wharfedale is designed to give musicians, club
owners and DJ’s the performance, reliability and
sound quality they require.
DESCRIPTION
The MP series consists of three models, the MP1200,
MP1 800 , MP2 800 . T hes e pow er amp lif ier s a re
designed for standard 19’’ (482mm) rack mounting.
They have power supplies with substantial heavy
high current transformers therefore each model
requires rear rack support to prevent stress on the
front panel. These amplifiers are housed in steel
casing suitable for rack ing in profess ional flight
cases.
OPERATING
Before switching on the power amplifier ensure
that ALL audio inputs are connected, ALL speaker
cab les are sec u rel y c onn e cte d, ALL volum e
controls on the front panel are fully off and that
the mains connections are safely and fully off and
that the mains connections are safely and securely
connected at the supply and amplier unit.
CLASS 3 WIRING
Cl as s 3 Wiring for TERMINALS with a mea su re d
open-cir cuit voltage excee ding 120V r.m.s. but
not exceeding 300 V r.m.s. when delivering NONCLIPPED OUTPUT POWER.
FOR COMMERCIAL PURPOSE ONLY.
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POWER AMPLIFIER
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Front Pane
1.POWER SWITCH
The power switch is used to turn on and off the AC
power.
2.POWER ON INDICATOR
The power indicator lights up when the amplier is
powered ON.
3.PROTECTION INDICATOR
The pr o tect i on s yste m s a r e a c tiva t ed w hen
overheating occurs or a DC voltage Is present at
the amplier outputs.
4.BRIDGE ON INDICATOR
When the rear panel’s STEREO/BRIDGE switch be
placed in BRIDGE. Then the front panel’s BRIDGE
indicator will be bright.
5.PEAK INDICATORS
PEAK indicator on each channel illuminates when
distortion reaches or exceeds approximately 1%.
6.INPUT ATTENUATORS
Separate level controls are provided for channel
one and channel two input, clockwise rotation of
the controls increase level.
Rear Panel
UK
USA
3 1 2
45
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POWER AMPLIFIER
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1.FANS
The fans should be kept free off all obstructions and be accessible to cool fresh air when possible. It is important
that the fans be used in a dust free environment.
2.OUTPUTS
Loudspeaker outputs are on large diameter 30A binding posts or Speakon NL4 connectors. The binding posts
may be used in 3 ways. In order of preference:
a)Use a quality 4mm Banana plug, colour coded, into the back of the binding posts.
b)Bare wire through the hole in the post, screwed down tight. This provides a very good electrical contact
which is also very secure. Use the heaviest gauge speaker cable possible. A 4mm banana plug may be
similarly clamped in this way.
c)Bare wire may be wrapped around the post and the clamp screwed down. Be sure to wind the wire
CLOCKWISE so that screwing down the clamp tightens the wrap. This gives a good electrical connection and
is secure if done properly. The SPEAKON sockets are wired: 1+ = positive, 1- = negative. 2+ and 2- are not used
under normal operations.
3.INPUTS
Each input channel is electronically balanced with one female XLR connector. In accordance with IEC and
AES/ANSI standards the wiring mode is Pin Ground, Pin Hot and Pin 3 Cold. The 1/4” Jack socket is also wired in
parallel with the XLR’S. The is Hot, the ring is Cold and the sleeve is Ground.
Balanced Operation: Either transformer balanced or with active drive. Connect the input between pins 2 and
3 with pin 2 positive. Do not connect pin 1, attached the shield to connector case (classes ground). Do not
connect the shield at this end to anything.
1.GROUND (shield)
2.HOT+
3.COLD-
4.AC INLET
Plug this AC input cord into AC outlet.
5.BRIDGED OUTPUT (MONO OPERATION)
To obtain a higher power output into a loudspeaker load the two stereo channels may be bridged to form
one (Mono) channel. To do this connect the positive speaker wire to the RED post on channel-A, and the
negative speaker wire to the RED post on channel-B. Alternatively the bridge Speakon can be used (the pin
conguration is 1+ =positive, 1- =negative). When in this mode the BRIDGE switch on the rear panel should be
set to BRIDGE and the signal input should be wired to channel A only.
Many loudspeaker cabinet have more than one connector in order to connect extra cabinets to the same
amplier channel without the need for splitter cables. These connectors are wired in PARALLEL. Two 16ohm
speakers wired in parallel equates to 8ohm (16/2=8). Three 16ohm speakers will give 5.3 ohm (16/3=5.3). Two
8ohm speakers wired in SERIES will add up to 16ohm, three 8ohm speakers would be 24ohm and so on. To
share power between two pairs or three pairs of similar speakers, they should be wired in SERIES/PARALLE. Two
8ohm speakers for example are wired in series giving 16ohm impedance. Two further 8ohm speakers are wired
in the same way, giving 16ohm. Each pair is then wired in paralled with the other to give a nominal 8ohm. The
power available from any amplier into an 8ohm load is shared equally amongst the four 8ohm speakers.
Bridging two channels of an amplifier combines the outputs to obtain twice the power. A 600+600 watt
amplier into 4ohm per channel will theoretically deliver 1200 watts into an 8ohm load. Four 8ohm 300-400 watt
speakers wired in series/parallel as described above would be able to handle this output. 4ohm loudspeaker
loads should only be used with care when in the bridged mode because the true load might be below 2ohms
and at high output levels the amplier’s protection circuits could operate.
GROUND HOT
COLD
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POWER AMPLIFIER
5
A great deal of mistakes in sound installatio n s c an be do wn to wr o ngl y wire d
audio connections. It is important that the
connections are correct to suit your system.
Unbalanced system
An unbalanced audio system is typically a
single conductor shielded with the centre
conductor relaying the signal and the shield
at ground.
Balanced system
Using a balanced audio system is where a
two conductor shielded cable has each
of the two centre conductors carrying the
signal but of opposite phase. This gives each
conductor an equal but inverted potential
difference from that of the ground.
It is recommend that you use balanced audo
connections if the unit before your amplifier
has a balanced output. This will eliminate such
as mains hum. For the best results xommon
grounding should be avoided. This means not
connecting the ground on both the ampliers
input and output connectors. Wharfedale
pro advise that you connect the ground
(shield) of the input connecting cable to the
ground of the signal source while making
sure the ground (shield) is not connected to
the amplifier’s input connector. The output
cable connector from the amplier if linking to
another amplier (daisy chained via parallel
in put sockets) shou ld ha ve th e gro un d
(shield) connected. The input connector
ground (shield) to the following amplifier
should not be connected. This is the process
by which the ground (shield) is connected
(tied) at the source unit but is not connect
to the destination unit. If hum develops in
some instances the ground (shield) can be
connected on the input. Some manufacturers
have units that recommend that the input
connector ground (shield) is tied and the
output disconnected. In this instance you may
need to connect the input connector ground
(shield) going to the input of the wharfedale
pro unit. If an unbalanced system is used with
XLR connections please connect pin 3 to pin
1 (ground) of the connector. This will mean
that pin 2 transports the positive (+/hot) signal.
If pin 3 to pin 1 are not connected this results
in the negative (-/cold) input being ‘open’.
This will give an audible degradation of the
signal to noise ratio. This would relate to both
the input and output connectors and involve
the cable ground (shield) connected at both.
Please note that some manufacturers run
their units with pin 2 (-/cold) and pin 3 (+/hot).
This should be looked out for and then the
wiring could be modied with labeled cables
so that conn ections of + /hot go to th eir
corresponding +/hot etc. Some manufactures
run their units wit h balanced inpu ts and
unbalanced outputs, therefore care should
be taken with the connections when inserted
into the system.
Etensive Thermal Protection
All though the MP series of amplifier feature
powerful cooling fans it is possible that there
wil l be an abnormally high temperature
rise under some circumstances. When this
ha ppens specia l sen sors will cause th e
amplier to protect itself by rst disconnecting
the loudspeakers and then by shutting down
the power supply until the temperature drops
to a more norma l temp eratu re. No rmal
operation resumes automatically once the
amplier cools down.
Output Short Circuit
The output lines can be accidentally shorted
together eigher by crossing the speaker wires
or because of defective loudspeakers. If the
short circuit remains in place then the thermal
protection system will eventually operate to
power down the complete amplier.
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS
BALANCED OUTPUT INPUT to Wharfedale Pro unit
SIGNAL DIRECTION
Ground(earth) CABLE Only connect ground if hum occurs
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH 1/4’’ JACK to XLR CONNECTORS
BALANCED OUTPUT
INPUT to Wharfedale Pro unit
SIGNAL DIRECTION
Ground(earth) CABLE Only connect ground if hum occurs
TIP
SLEEVE
RING
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH STEREO 1/4’’ JACK to XLR CONNECTORS
BALANCED OUTPUT
INPUT to Wharfedale Pro unit
SIGNAL DIRECTION
Ground(earth) CABLE Only connect ground if hum occurs
TIP
SLEEVE
RING
RING
TIP
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS to STEREO 1/4’’ JACK
BALANCED OUTPUT
INPUT to
Wharfedale Pro unit
SIGNAL DIRECTION
Ground(earth) CABLE Only connect ground if hum occurs
SLEEVE
TIP
RING
UNBALANCED INPUT AND OUTPUT WIRING WITH MONO 1/4’’ JACK CONNECTIONS
OUTPUT
INPUT to Wharfedale Pro unitSIGNAL DIRECTION
INPUT
TIP
Ground(earth) CABLE
SLEEVE
TIP
SLEEVE
BALANCED OUTPUT WIRING FROM WHARFEDALE PRO UNIT WITH XLR CONNECTORS TO BALANCED UNIT
OUTPUT from wharfedale Pro unit
SIGNAL DIRECTION
BALANCED INPUT
Ground(earth) CABLE Only connect ground if hum occurs
SLEEVE
SIGNAL DIRECTION
OUTPUT to Wharfedale Pro unit
Page 8
Specifications
MODEL
POWER: PER CHANNEL (1% THD)
Stereo Mode
8 Ohms
4 Ohms
2 Ohms
Bridged Mono Mode:
8 Ohms
4 Ohms
INPUT SENSITIVITY & IMPEDANCE
AT 4 Ohms
UNBALANCED 1/4" Jack
BALANCED XLR
VOLTAGE GAIN
SLEW RATE: 8 ohms FULL SWING
STEREO
MP 1200
260 Watts
400 Watts
640 Watts
800 Watts
1280 Watts
0.775v
10k Ohms
20k Ohms
35dB
>30v/u sec
MP 1800
330 Watts
600 Watts
900 Watts
1200 Watts
1800 Watts
0.775v
10k Ohms
20k Ohms
36dB
>30v/u sec
MP2800
0.775v
10k Ohms
20k Ohms
38dB
>40v/u sec
CHANNEL SEPARATION
SIGNAL TO NOISE (20Hz-20kHz)
DISTORTION (SMPTE-1M)
FREQUENCY RESPONSE:
+/-1dB @ 4 Ohms
+/-3dB @ 4 Ohms
DAMPING FACTOR (8 ohms, 1kHz)
TOPOLOGY
CONNECTORS
INPUT
OUTPUT
CONTROLS
Front
Rear
INDICATORS
COOLING
WEIGHT (GROSS)
WEIGHT (NET)
DIMENSIONS (H x W x D) mm
DIMENSIONS (H x W x D) inches
76dB
100dB
less than 0.05%
20Hz to 20kHz
5Hz to 50kHz
Greater than 300
Class AB
XLR & 1/4" TRS
5 WAY BINDING POSTS &
SPEAKON OR SPEAKON
AC Switch, CH1 &
CH2 gain knobs
Stereo/Bridge mode switch
Power switch on/off mute,
Short circuit,
Open circuit, Thermal
VARIABLE SPEED FAN
23kg / 50.6lbs
21.5kg / 47.3lbs
133 x 483 x 355
5.2 x 19 x 13.9
76dB
100dB
less than 0.05%
20Hz to 20kHz
5Hz to 50kHz
Greater than 300
Class AB
XLR & 1/4" TRS
5 WAY BINDING POSTS &
SPEAKON OR SPEAKON
AC Switch, CH1 &
CH2 gain knobs
Stereo/Bridge mode switch
Power switch on/off mute,
Short circuit,
Open circuit, Thermal
VARIABLE SPEED FAN
25kg / 55lbs
23.5kg / 51.7lbs
133 x 483 x 355
5.2 x 19 x 13.9
78dB
100dB
less than 0.05%
20Hz to 20kHz
5Hz to 50kHz
Greater than 400
Class H
XLR & 1/4" TRS
5 WAY BINDING POSTS &
SPEAKON OR SPEAKON
AC Switch, CH1 &
CH2 gain knobs
Stereo/Bridge mode switch
Power switch on/off mute,
Short circuit,
Open circuit, Thermal
VARIABLE SPEED FAN
29.5kg / 65lbs
28kg / 61.6 lbs
133 x 483 x 355
5.2 x 19 x 13.9
Specications and design subject to shange without notice for improvements.
Wharfedale website:www.wharfedalepro.com
Wharfedale International Limited
Sovereign Court,Ermine Business Park, Huntingdon,
Cambs,PE296XU,England
1700 Watts
2700 Watts
600 Watts
950 Watts
1450 Watts
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