Wharfedale Stereo Amplifier MP 1200 User Manual

MP 1200 / 1800 Power Amplifier  
CHANNEL A  
(BRIDGE)  
CHANNEL B  
5
ON  
5
6
4
6
4
3
1
3
7
7
9
OFF  
CHA  
PEAK  
CHB  
PEAK  
8
8
2
2
POWER PROTECT BRIDGE  
1
9
0
0
10  
10  
LEVEL  
LEVEL  
Operating Manual  
 
POWER AMPLIFIER  
PLEASE READ IMPORTANT INSTRUCTIONS  
BEFORE USING THE AMPLIFIERS! SAFETY  
INSTRUCTIONS  
APPLICATION  
The new Mp range of power amplifiers from Wharfedale is  
designed to give musicians, club owners and DJ's the  
performance, reliability and sound quality they require.  
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,  
fluids 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 in place and not in defeat mode (ie.  
earth 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.  
DESCRIPTION  
The MP series consists of two models, the Mp1200,  
Mp1800. These power amplifiers are designed for  
standard 19" (482mm) rack mounting. They have power  
supplies with substantial heavy high current transformers  
threrefore each model requires rear rack support to prevent  
stress on the front panel. These amplifiers are housed in  
steel casing suitable for racking in professional flight cases.  
OPERATING  
Before switching on the power amplifier ensure that ALL  
audio inputs are connected, ALL speaker cables are  
securely connected, ALL volume 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 amplifier unit.  
CLASS 2 WIRING  
POWER NOTICE FOR SAFETY  
Class 2 wiring for all terminals provided the audio output  
power exceeds 10W per channel under normal operating  
conditions or the apparatus is intended to be installed or  
interconnected in the field by a skilled person.  
All british and european countries have a nominal 230v  
mains power supply which in practice is between 220V  
and 240V. In the USA the 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  
it 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 Must Be 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.  
2
MP 1200/1800  
 
POWER AMPLIFIER  
Front Panel  
CHANNEL A  
CHANNEL B  
5
ON  
(BRIDGE)  
5
4
6
4
6
3
1
3
1
7
7
9
OFF  
CHA  
PEAK  
CHB  
PEAK  
8
8
2
2
POWER PROTECT BRIDGE  
9
0
0
10  
10  
LEVEL  
LEVEL  
4
5
2
3
1
1. PROTECTION INDICATOR  
The pro-tection systems are activated when overheating occurs or a DC voltage Is present at the amplifier outputs.  
2. PEAK INDICATORS  
PEAK indicator on each channel illuminates when distortion reaches or exceeds approximately 0.1%.  
3. INPUT ATTENUATORS  
Separate level controls are provided for channel one and channel two input, clockwise rotation of the controls increase level.  
4. POWER SWITCH  
The power switch is used to turn on and off the AC power.  
5. POWER ON INDICATOR  
The power indicator lights up when the amplifier is powered ON.  
.
Rear Panel  
3
2
1
BRIDGED OUTPUT  
1800W 4 OHM  
FUSE  
T10AL250V  
N11189  
~
AC 220-240V 50Hz 2400W  
UK  
4
5
3
2
1
N11189  
CONFORMS TO  
UL STD. 6500  
®
C
US CERTIFIED  
TO  
CAN/CSA STD. E60065  
3021177  
USA  
5
4
3
MP 1200/1800  
 
POWER AMPLIFIER  
1. FANS  
The fans should be kept free of 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 diamete 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: - l+ = positive, 1- = negative. 2+ and2- 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 1 Ground, Pin 2 Hot and Pin 3 Cold. the 1/4" Jack socket is also wired in parallel with the XLR'S. the Tip 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+  
2
1
3. COLD-  
3
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 configuration is l + = 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 cabinest have more than one connector in order to connect extra cabinets to the same amplifier 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 5.3ohm(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/PARALLEL. 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 amplifier 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. A600+600 watt amplifier 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 amplifier's  
protection circuits could operate.  
4
MP 1200/1800  
 
POWER AMPLIFIER  
Specifications  
RATED OUTPUT POWER  
MP 1200  
MP 1800  
Stereo mode , EIA: Bothe Channels Driven  
8W(1%THD)  
260 Wx 2  
400 Wx 2  
640W x2  
330W x2  
600 Wx 2  
900W x2  
4W(1%THD)  
2W(1%THD)  
Bridged mono,mode  
8W(1%THD)  
800 W  
1200 W  
1800 W  
4W(1%THD)  
1280 W  
INPUT SENSITIVITY & IMPEDANCE:  
@ ratedoutput power,4 ohms  
Unbalanced, 1/4 hone jack  
Balanced ,XLR  
0.775 V  
10Kohms  
20Kohm  
35dB  
0.775V  
10Kohms  
20Kohm  
35dB  
VOLTAGE GAIN  
SLEW RATE:8W full swing  
Stereo  
>30v/ sec  
> 50v/ sec  
76dB  
> 30v/ sec  
> 50v/ sec  
76dB  
Bridged mono,mode  
CHANNEL SEPARATION:  
SIGNAL TO NOISE(20Hz-20KHz)  
DISTORTION:(SMPTE-IM)  
FREQUENCY RESPONSE:  
(+/-1dB) @rated output, 4ohms  
(+/-1dB) @rated output, 4ohms  
DAMPINGFACTOR: (8 ohms, 1 KHz)  
TOPOLOGY  
>100dB  
>100dB  
less then0.01%  
less then 0.01%  
20Hz-20KHz  
5Hz-50KHz  
Greaterthen 300  
AB  
20Hz-20KHz  
5Hz-50KHz  
Greater then 300  
AB  
CONNECTORS:  
,,  
,,  
Input  
XLRand1/4 TRS  
XLRand1/4 TRS  
Output  
5way binding postsor Neutrik Speakon 5 way bindingposts or Neutrik Speakon  
CONTROLS  
Front  
AC switch, CH.1 and CH.2 gainknobs  
Stereo/Briding mode switch  
Power switch on/off mute, Short circuit, Open  
Circuit, Thermal  
AC switch, CH.1andCH.2 gain knobs  
Stereo/Briding mode switch  
Power switch on/off mute, Shortcircuit ,Open  
circuit, Thermal  
Real  
INDICATORS  
COOLING  
Continuously vasriable-speedfan  
Continuously vasriable-speedfan  
WEIGHT  
Gross Weight  
Net Weight  
23Kg  
21.5Kg  
25Kg  
23.5Kg  
DIMENSION(HxWxD)  
480x360x150(mm)  
480x360x150(mm)  
Specifications and design subject to shange without notice for improvements.  
5
MP 1200/1800  
 
POWER AMPLIFIER  
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS  
BALANCED OUTPUT INPUT to Wharfedale Pro unit  
A great deal of mistakes in sound  
installations can be down to wrongly wired  
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.  
SIGNAL DIRECTION  
2
1
1
2
Ground (earth)  
Only connect ground if hum occurs  
CABLE  
3
3
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.  
,,  
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH 1/4 JACK to XLR CONNECTORS  
INPUT to Wharfedale Pro unit  
SIGNAL DIRECTION  
BALANCED OUTPUT  
RING  
1
2
TIP  
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 amplifiers 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  
amplifier if linking to another amplifier  
(daisy chained via parallel input sockets)  
should have the ground (shield) connected.  
The input connector ground (shield) to the  
following amplifier should not beconnected.  
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.  
SLEEVE  
Ground (earth)  
Only connect ground if hum occurs  
CABLE  
3
,,  
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH STEREO 1/4 JACK to XLR CONNECTORS  
SIGNAL DIRECTION  
BALANCED OUTPUT  
INPUT to Wharfedale Pro unit  
RING  
SLEEVE  
TIP  
RING  
TIP  
SLEEVE  
Ground (earth)  
CABLE  
Only connect ground if hum occurs  
,,  
BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS to STEREO 1/4 JACK  
BALANCED OUTPUT  
INPUT to  
SIGNAL DIRECTION  
Wharfedale Pro unit  
SLEEVE  
TIP  
2
1
Ground (earth)  
CABLE  
Only connect ground if hum occurs  
3
RING  
,,  
UNBALANCED INPUT AND OUTPUT WIRING WITH MONO 1/4 JACK CONNECTIONS  
OUTPUT  
SIGNAL DIRECTION  
SIGNAL DIRECTION  
INPUT to Wharfedale Pro unit  
INPUT  
OUTPUT Wharfedale Pro unit  
SLEEVE  
TIP  
TIP  
SLEEVE  
Ground (earth)  
CABLE  
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 modified with  
labelled cables so that connections of +/hot  
go to their corresponding +/hot etc. Some  
manufactures run their units with balanced  
inputs and unbalanced outputs, therefore  
care should be taken with the connections  
when inserted into the system.  
BALANCED OUTPUT WIRING FROM WHARFEDALE PRO UNIT WITH XLR CONNECTORS TO BALANCED UNIT  
OUTPUT from Wharfedale Pro unit  
BALANCED INPUT  
SIGNAL DIRECTION  
2
1
1
2
Ground (earth)  
CABLE  
Only connect ground if hum occurs  
3
3
6
MP 1200/1800  
 
Etensive Thermal Protection  
All though the MP Series of amplifier feature powerful cooling fans it is possible that there will be an abnormally high temperature  
rise under some circumstances. When this happens special sensors will cause the amplifier to protect itself by first disconnecting the  
loudspeakers and then by shutting down the power supply until the temperature drops to a more normal temperature.Normal  
operation resumes automatically oncethe amplifier cools down.  
Output Short Circuit  
The output lines can be accidentally shorted together either by crossing the speaker wires or because of defective loudspeakers. If  
the short circuit remains in place then the thermal proteciton system will eventually operate to power down the complete amplifier.  
Wharfedale website:www.wharfedalepro.com  
Wharfedale International Limited  
Sovereign Court,Ermine Business Park, Huntingdon,  
Cambs,PE29 6XU,England  
 

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