Musical Fidelity KW750 Power Manuel utilisateur

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 1of 9

kW 750 Power

DUAL MONO POWER AMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity kW 750 amplifier.

Used properly and carefully, it should give many years of outstanding musical

reproduction.

Aesthetically, the kW 750 Power amplifier is a perfect match for the

kW Hybrid Line Pre-amplifier and kW Phono Pre-amplifier.

Together they form one of the finest hi-fi systems available.

Dust regularly with a soft duster or soft brush, but be careful when using cleaning

or polishing agents - they may harm the surface finish.

If you have any questions about your audio system,

please consult your dealer who is there to help and advise.

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 2of 9

SAFETY INFORMATION

IMPORTANT!(U.K. only)

This unit is supplied in the U.K. with a mains lead fitted with a moulded 13 amp plug. If, for any

reason, you need to cut off the plug, please remove the fuse holder and dispose of the plug safely,

out of reach of children. It must not be plugged into a mains outlet.

The wires in the mains lead supplied with this appliance are coloured in accordance with the

following code:

Green and yellow..............Earth

Blue................................Neutral

Brown.................................Live

WARNING - This appliance must be earthed

As the colours of the wires of the mains lead of this appliance may not correspond with the coloured

markings identifying the terminals in your plug, proceed as follows:

The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is

marked with the letter E or coloured green or green-and-yellow, or by the earth symbol:

The wire which is coloured brown must be connected to the terminal which is marked with the letter

L or coloured red.

The wire which is coloured blue must be connected to the terminal which is marked with the letter N

or coloured black.

If connecting to a BS1363 plug, a 13 amp fuse must be used.

WARNING:

The kW 750 is a powerful amplifier and must necessarily supply high voltages through

the loudspeaker terminals. Therefore, to avoid any possibility of an electric shock

DO NOT TOUCH THE SPEAKER TERMINALS when the unit is being used.

To comply with BSEN60065 safety regulations, the 4mm “banana” plug holes have

been fitted with plastic blanking pieces. Removal of these will invalidate any electrical

safety approval of this product.

WARNING:

Any modifications to this product not expressly approved by Musical Fidelity who is

the party responsible for standards compliance could void the user’s authority to

operate this equipment.

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 3of 9

GENERAL ADVICE

INSTALLATION PRECAUTIONS and USER INFORMATION

Your new kW 750 amplifier is designed and built to provide trouble-free performance, but as with

all electronic devices it is necessary to observe a few precautions:

Heed all warnings shown on the back of the product.

Only connect the kW 750 to a mains outlet having the same voltage as marked at the back of the

unit.

Always ensure that when disconnecting and reconnecting your audio equipment the mains supply is

switched off.

Position the mains lead and signal interconnects wher

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 5of 9

CONNECTIONS and FACILITIES –Power Supply

Illuminated feet (blue) POWER indicator LED Master POWER control push-button (see page 7)

FRONT PANEL

REAR PANEL

(see page 6)

Power supply output to

amplifier – right channel

Power supply control to

and from amplifier unit

Power supply output to

amplifier – left channel IEC type mains

inlet socket

Control circuit fuse holder Main power supply fuse holder

(Fuses are dealer serviceable items only – to be replaced with same type and current rating)

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 6of 9

CONNECTIONS

All input, output and power connections should

be made with the mains power switched OFF.

INPUT CONNECTIONS

The kW 750 amplifier can be used with any

preamplifier or any line level source which has a

volume control. We highly recommend the

matching kW Hybrid Line preamplifier available

from Musical Fidelity.

Using good quality co-axial audio leads, connect

the left and right outputs from your pre-amp or

other line level source to the RCA inputs on the

back panel marked as LEFT and RIGHT

INPUT. The corresponding LOOP OUTPUT

sockets are directly connected inside the unit to

duplicate the line inputs. This is to enable

optional onward connection to another amplifier,

for example when used for “bi-amplification”.

LOUDSPEAKER CONNECTIONS

Connect your loudspeakers to the terminals on

the back panel marked LEFT- and RIGHT

SPEAKERS. Two sets are provided for left and

right, but the combined load impedance for each

channel must not be less than 4 Ohms.

One wire from each speaker lead pair goes to the

red (+) terminal and the other to black (-). The

wiring must be “in phase”, namely, the red and

black terminals must be connected to the left and

right speakers the same way round.

POWER CONNECTIONS

In addition to the IEC type mains lead, three

low voltage accessory interconnection leads are

provided. Two of these are for independent

supply of power to each of the left and right

power amplifiers, and the third is for the pre-

amplifier.

Connect the single, thinner, lead between the

socket on the amplifier unit marked PREAMP

PSU INPUT and the socket on the power

supply unit marked CONTROL PSU

OUTPUT.

Connect the remaining two (thicker) leads

between the sockets on the amplifier unit

marked LEFT- and RIGHT PSU INPUT to

corresponding sockets on the power supply unit

marked LEFT- and RIGHT PSU OUTPUT.

BEFORE SWITCHING ON . . . . .

Plug the accessory IEC mains lead into the rear

panel socket, then the other end into a

convenient wall outlet.

Turn the volume control on your pre-amplifier

to minimum, and switch on its power.

Warning :

The negative (black) terminal is part of a

“bridged” circuit, and has live speaker

output. It must not therefore be connected

to any chassis or earth terminal.

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 7of 9

OPERATION

Press the master POWER push-switch on the

front panel of the power supply unit. The blue

POWER LED above the switch will light to

confirm that power is applied to this unit only.

If the power supply and amplifier have been

inter-connected correctly, the central blue

POWER LED on the front panel of the

amplifier will also illuminate to confirm that

power is applied to the amplifier unit.

Power to both units can now be controlled by

pressing a second POWER touch-button on the

kW 750 amplifier front panel. When pressed,

the two outer blue SUPPLY LEDs on the

amplifier light, and the power supply feet will

glow blue. However, for a few seconds no

sound can be heard from your speakers, and the

amplifier feet will light red to indicate initial

mute action. A few seconds later the feet

colour will change to yellow showing that your

kW 750 is ready for use. After about 35

minutes of operation, the amplifier feet colour

will further change to blue. Note that the feet

under the power supply unit do not change

colour.

Select the required audio input source on your

pre-amplifier, and adjust the volume control for

the preferred sound level.

Press the master POWER switch on the power

supply unit a second time when required to

switch off and isolate the kW 750 system

completely from the mains.

AUTOMATIC FAULT DETECTION

There are sensors in each left and right channel

to detect adverse operating conditions, such as

excessively high volume control setting, or

incorrect loudspeaker load. Under these

conditions, the affected channel will stop

working and either left- or right-hand red

PROTECT LED on the amplifier front panel

will light. The LED will remain lit until the

cause of the overload is removed.

Issue 1 : February 2005

kW 750 Power Amplifier Instructions for use Page 8of 9

PROBLEMS?

Basic problem-solving with an amplifier is similar to troubleshooting other electrical or electronic

equipment. Always check the most obvious possible causes first, such as the following examples:

Problem Probable Cause Remedy

No power when POWER

button is pressed

Mains power plug is not fully

inserted into rear socket

Plug in securely

No sound Tape monitor function has been

selected on the pre-amplifier

Switch off tape monitor

Wrong connections between input

source and the kW 750

Check audio input lead

connections

Speakers not connected, or

incorrectly wired

Check speaker cables

Sound is not precise, lacking

in bass and stereo image

Speakers are connected out of

phase, i.e., connections to one

speaker (+ and -) are reversed

Ensure speakers are connected

correctly

Hum Audio connector plug not fully

pushed in

Insert plug securely

Connector cable is faulty Check that the cable outer

shield (screen) connection has

not become damaged or

detached inside the plug

If none of these actions effect a cure, please contact your dealer, or an authorised Musical Fidelity

service agent. Remember, never open the case of the kW 750 amplifier yourself, as this will

invalidate the guarantee.

Issue 1 : February 2005 kW 750 Power Amplifier Instructions for use Page 9of 9

kW750

DUAL MONO POWER AMPLIFIER

.SPECIFICATIONS.

Output : Power : 750 Watts per channel into 8 Ohms (29dBW),

1100 Watts per channel into 4 Ohms

Voltage, RMS : 77.5 Volts 20Hz to 20kHz

Voltage, peak-to-peak : 219 Volts

Current, peak-to-peak : 250 Amps

Damping factor : 204

Output devices per channel : 20

Loop out impedance : 50 Ohms

Line inputs :

Total harmonic distortion + noise : < 0.004% 20Hz to 20kHz

Signal / noise ratio : > 124dB ‘A’-weighted

Input sensitivity for 750 Watts into 8 Ohms : 2.4 Volts

Input impedance : 100k Ohms

Channel separation : > 93dB typical

Frequency response : 20Hz to 20kHz, +0, -0.2dB

Input : 1 pair line level RCA connectors

Outputs : 2 amplifier channels via 2 pairs per channel binding posts,

1 pair RCA loop output sockets

Power requirement : 100 /115 /230Volts AC 50 /60Hz (factory pre-set),

2500 Watts at maximum audio power into 8 Ohms, 290 Watts idle

Dimensions : Amplifier : 483 mm, 19 inches wide

167 mm, 21.8 inches high including feet

553 mm, 15.75 inches deep including rear terminals

Power supply : 364 mm, 14.4 inches wide

167 mm, 6.6 inches high including feet

278 mm, 11 inches deep including rear sockets

Weight : Amplifier : 34.1 kg, 75.1 lbs unit only, unboxed,

45.2 kg, 100 lbs in shipping carton

Power supply : 18.4 kg, 40.6 lbs unit only, unboxed,

21.4 kg, 47.2 lbs in shipping carton

Standard IEC mains lead - (16-Amp type) : one, 2.4 metres (94.5 inches)

accessories : Low voltage interconnection leads : two, 1.2 metres (47.3 inches)

Control interconnection lead : one, 1.2 metres (47.3 inches)

Musical Fidelity reserves the right to make improvements which

may result in specification or feature changes without notice.

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