Musical Fidelity A5 CR Bedienungsanleitung

Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 1of 7

POWER AMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity A5 CR Power amplifier.

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

reproduction.

Aesthetically, the A5 CR Power amplifier is a perfect match for the

A5 CR Pre-amplifier and A5 CD player.

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 : November 2004 A5 CR Power Amplifier Instructions for use Page 2of 7

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 A5 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 : November 2004 A5 CR Power Amplifier Instructions for use Page 3of 7

GENERAL ADVICE

INSTALLATION PRECAUTIONS and USER INFORMATION

Your new A5 CR Power 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 A5 CR Power 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 where they are not likely to be walked on or trapped

by items placed on them.

Do not use near water, or place water-filled containers on the amplifier, for example, a flower vase

or potted plants. If water does spill inside, immediately pull out the mains plug from the wall

socket and inform your dealer, who should then check the unit before further use. Entry of

liquid into the amplifier is dangerous, and may cause electric shock or fire hazard.

Do not place the unit near direct heat sources such as radiators, direct sunlight or other equipment.

Do not remove any covers or try to gain access to the inside. There are no internal adjustments or

fuses you can replace yourself. Refer all service work to an authorised Musical Fidelity agent.

Note: Unauthorised opening of the equipment will invalidate any warranty claim.

Dust regularly with a soft cloth or soft brush but be careful when using cleaning or polishing agents -

they may harm the surface finish.

The electronics in modern hi-fi equipment is complex and may, therefore, be adversely affected or

damaged by lightning. For protection of your audio system during electrical storms, remove the

mains plugs and disconnect any aerial lead.

If after-sales service is required, to help your dealer identify the A5 CR Power amplifier please quote

the serial number located on the rear panel of the unit.

RADIO FREQUENCY INTERFERENCE (R.F.I)

This product has been tested to ensure that its operation is not adversely affected by normal

background levels of R.F.I., and that it does not itself generate excessive amounts of interference.

However, if a problem persists, please contact your Musical Fidelity agent.

Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 4of 7

CONNECTIONS and FACILITIES

POWER MUTE INPUT A Input selector

on /off switch indicator LED indicator LED button (see page 5)

FRONT PANEL

REAR PANEL

IEC mains power inlet socket

RIGHT SPEAKER

OUTPUT terminals

loop-OUTPUT

sockets

- see page 5

INPUT sockets

- see page 5

LEFT SPEAKER

OUTPUT terminals

INPUT B indicator LED

POWER-on indicator LED

Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 5of 7

CONNECTIONS and OPERATION

All input, output and power connections should

be made with the mains power switched OFF.

INPUT CONNECTIONS

The A5 CR Power amplifier can be used with any

preamplifier or line level source which has a

volume control. We highly recommend the

matching A5 CR Preamplifier available from

Musical Fidelity.

Two stereo pairs of RCA audio input sockets

marked “A” and “B” on the rear panel allow a

choice between either of these input sources.

Simultaneous mixed Aand Boperation is not

possible.

Using good quality co-axial audio leads,

connect the left and right outputs from your pre-

amp or other line level source to either or both

Aand Binputs.

Whichever input is chosen, a fixed “line level”

audio output from the selected source is

available from the adjacent OUTPUT RCA

sockets for onward connection to another

amplifier. This is to allow for “bi-

amplification” (see below).

BI-AMPLIFICATION

The A5’s RCA OUTPUT sockets allow “bi-

amplification” of a speaker system using

suitable external amplifiers and crossover

networks. This enables the speaker drive units

to be powered separately, giving noticeable

improvement in clarity, imaging and bass

weight.

In this arrangement, typically one A5 CR Power

amplifier is used to drive the “tweeter” (high

frequencies), and another to drive the “woofer”

(low frequencies) of each loudspeaker

enclosure. Thus, two A5s would be needed for

a stereo pair.

(continued . . . )

If in doubt about bi-amplification, please

contact your dealer for advice.

LOUDSPEAKER CONNECTIONS

Connect your loudspeakers to either of the two

pairs of loudspeaker terminals situated on the

back panel marked as LEFT and RIGHT

SPEAKER OUTPUT. The wiring must be

“in phase”, namely, the + and - terminals must

be connected to the left and right speakers the

same way round.

Note: - the combined load impedance must not

be less than 4 ohms.

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.

OPERATION

Press the POWER switch button on the left-

hand end of the front panel on the A5 CR Power.

The blue POWER LED will light to confirm

that the unit is ready for use.

However, for a few seconds no sound will be

heard from your speakers, and the red mute

indicator LED near the button will be lit,

confirming initial mute action.

Select the required audio input source Aor B

by pressing the selector button on the right-

hand end of the front panel. Now increase the

volume control on your pre-amplifier to obtain

the preferred sound level.

Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 6of 7

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 A5 Power

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

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 A5 CR Power amplifier yourself, as this will

invalidate the guarantee.

Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 7of 7

A5CR .SPECIFICATIONS.

POWER AMPLIFIER

Output : Power : 255 Watts per channel into 8 Ohms (24dBW),

416 Watts per channel into 4 Ohms

Voltage, RMS : 45.2 Volts 20Hz to 20kHz

Voltage, Peak-to-peak : 118.8 Volts

Current peak-to-peak 200 Amps

Damping factor : 170

Output devices per channel : 8

Line inputs :

Total harmonic distortion + noise, < 0.01% 20Hz to 20kHz

Signal / noise ratio > 109dB ‘A’-weighted

Input sensitivity for 255 Watts into 8 Ohms 1.5V

Input impedance 100k Ohms

Channel separation > 90dB typical

Frequency response 10Hz to 100kHz, +0, -1.5 dB

Inputs : “A” 1 pair line level RCA connectors

“B” 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),

750 Watts maximum into 8 Ohms, 70 Watts idle

Weight : 19.1 kg, 42.1 lbs unit only, unboxed

23.75 kg, 52.4 lbs in shipping carton

Dimensions : 440 mm, 17.3 inches wide

125 mm, 4.9 inches high including feet

400 mm, 15.75 inches deep including terminals

Standard accessories : IEC type mains lead (10-Amp type)

Musical Fidelity reserves the right to make improvements which

may result in specification or feature changes without notice.

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