Musical Fidelity A308 CR Manual de usuario

A308 CR Power Instructions for Use Page 1of 7

Issue 3: March 2003

A308CR

DUAL MONO POWER AMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity A308 CR Power amplifier.

Used properly and carefully, it should give you many

years of outstanding musical reproduction.

Aesthetically, the A308 CR Power amplifier is a perfect match

for the A308 CR Preamplifier and A308 CR CD player.

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

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.

MUSICAL FIDELITY A308CR

DUAL MONO POWER AMPLIFIER

POWER INPUT SELECTOR

A B

A308 CR Power Instructions for Use Page 2of 7

Issue 3: March 2003

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 this 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 A308 CR 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 elec-

trical 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.

A308 CR Power Instructions for Use Page 3of 7

Issue 3: March 2003

GENERAL ADVICE

INSTALLATION PRECAUTIONS and USER INFORMATION

Your new A308 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 A308 CR amplifier 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, flower

vases 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 heat sources such as radiators, direct sunlight or other equipment.

The case of this amplifier can run at high temperatures - operate the unit in a well ventilated

area, and do not touch the side heatsink fins after periods of use at high output power.

Do not remove covers or try to gain access to the inside. There are no internal user adjust-

ments. Refer all service work to an authorised Musical Fidelity agent.

NOTE: Unauthorised opening of the equipment will invalidate any warranty claims.

There are fuses inside the A308 CR amplifier. In the unlikely event that one blows, refer the unit

to your audio dealer. Do NOT try to replace the fuse yourself as this will invalidate the war-

ranty.

Dust regularly with a soft duster 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 A308 CR 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 interfer-

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

A308 CR Power Instructions for Use Page 4of 7

Issue 3: March 2003

CONNECTIONS AND FACILITIES

MUSICAL FIDELITY

A308 DUAL MONO POWER AMPLIFIER

C R

MANUFACTURED IN ENGLAND BY MUSICAL FIDELITY

POWER

CONSUMPTION

1000W

THIS APPLIANCE

MUST BE

EARTHED

IMPORTANT

50/60Hz

MOUNT UNIT ON SOLID SURFACE.

DO NOT REMOVE SCREWS OR COVERS UNDER ANY CIRCUMSTANCES.

NO USER SERVICEABLE COMPONENTS INSIDE.

REFER SERVICING TO QUALIFIED ENGINEER.

SEE OWNERS MANUAL FOR FURTHER INFORMATION. CC

RIGHT CHANNEL LEFT CHANNEL

INPUTA

INPUT B

LOOP OUTPUT LOOP OUTPUT

INPUT B

INPUTA

CAUTION

RIGHT SPEAKER

OUTPUT

LEFT SPEAKER

OUTPUT

6 789 10 11 12 13 14

Front panel layout

1Power on indicator LED

2Power on/off switch

3Input A indicator LED

4Input selector button

5Input B indicator LED

(see page 5)

Back panel layout

6Right speaker output

7Right loop output (see page 5)

8Right input “A”

9Right input “B”

10 Left input “B”

11 Left input “A”

12 Left loop output (see page 5)

13 Left speaker output

14 IEC mains inlet

MUSICAL FIDELITY A308CR

DUAL MONO POWER AMPLIFIER

POWER INPUT SELECTOR

A B

1 2 345

A308 CR Power Instructions for Use Page 5of 7

All input, output and power connections

should be made with the mains power

switched OFF.

INPUT CONNECTIONS

The A308 CR power amplifier can be used

with a preamplifier or any line level source

which has a volume control. We highly

recommend the matching A308 CR pream-

plifier available from Musical Fidelity.

There are two audio inputs on the amplifi-

er, Aand B, which are selected by a push-

push switch located at the right-hand end

of the front panel.

Using good quality co-axial audio leads,

connect the left and right outputs from

your pre-amp or other line level source to

either Aor Bof the two RCA socket input

groups on the back panel marked as LEFT

and RIGHT CHANNEL INPUT.

The LOOP OUTPUT sockets are elec-

tronically routed inside the unit to dupli-

cate whichever of the Aor Bline inputs

has been selected for speaker output by the

A308 CR. This is to enable onward con-

nection to another amplifier, for example

when used for “bi-amplification”.

Issue 3: March 2003

LOUDSPEAKER CONNECTIONS

All connections should be made with the

power OFF.

Connect your loudspeakers to the loud-

speaker terminals situated on the back panel

marked as LEFT and RIGHT SPEAKER

OUTPUT. Two pairs are provided for con-

venience, but note that the combined load

impedance must not be less than 4 ohms

for either channel.

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 preampli-

fier to minimum, and switch on its power.

OPERATION

Press the POWER switch on the front

panel of the A308 CR - the blue POWER

LED will light to confirm that the unit is

ready for use.

Select either input Aor input Bby pressing

the selector button at the right-hand end of

the front panel. Each press of the button

alternates between Aand Binput.

Select the required audio input source on

your pre-amplifier, and advance the volume

control to obtain the preferred sound level.

CONNECTIONS and OPERATION

A308 CR Power Instructions for Use Page 6of 7

Issue 3: March 2003

PROBLEMS ?

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

electronic equipment. Always check the most obvious possible causes first. To give you a few

ideas of what to look for, check the following:

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 A308 CR Power amplifier your-

self, as this will invalidate the guarantee.

Problem Possible Cause Remedy

No power when MAINS Mains plug not inserted Plug in securely

POWER switch is operated fully into rear socket

No sound Tape monitor function has Switch off tape monitor

been selected on the pre- at the pre-amplifier

amplifier

Wrong connections between Check audio input lead

pre-amplifier and the A308 CR connections

Speakers not connected, or Check speaker cables

incorrectly wired

The sound is not precise, Speakers are connected out of Ensure method of conn-

lacking bass and stereo phase, i.e. connections to one- ection is the same for left

image speaker (+ and -) are reversed and right speakers

A308 CR Power Instructions for Use Page 7of 7

SPECIFICATIONS :

Output voltage, RMS 45 Volts 20Hz to 20kHz

peak 127 Volts

Power output, single or both channels driven 250 Watts per channel into 8 Ohms (24dBW)

450 Watts per channel into 4 Ohms

Peak-to-peak output current 72 Amps

Damping factor 180

Output devices per channel 6

Total Harmonic Distortion + noise 0.003% at 1kHz up to 90% power, into 4 or 8 Ohms

< 0.007% 10Hz to 40kHz at 12.5 Watts into 8 Ohms

Intermodulation distortion 0.002% at 12.5 Watts into 8 Ohms

Frequency response 20Hz to 20kHz ±0dB

10Hz to 100kHz +0 / -1.5dB

Channel separation > 100dB 20Hz to 20kHz

Audio gain 30dB (31.5 times) nominal

Input impedance 31K Ohm

Input sensitivity for full power output into 8 Ohms 1.42 Volts

Signal / noise ratio, reference full power output > 124dB “A”- weighted

Inputs “A” : 1 pair RCA connectors, selectable from the front panel

“B” : 1 pair RCA connectors, selectable from the front panel

Outputs 2 amplifier channels via 2 pairs of speaker binding posts

per channel,

1 pair RCA loop output sockets

Power requirements 100 / 115 / 230V AC, 50 / 60Hz (factory preset)

1000 Watts maximum into 8 Ohms load

70 Watts idle

Dimensions 440 mm, 17.3 inches wide

143 mm, 5.6 inches high including feet

394 mm, 15.5 inches deep including terminals

Weight 23.5 kg, 51.7 lbs unit only, unboxed

26 kg, 57.2 lbs in shipping carton

Standard accessories IEC type mains lead

Issue 3: March 2003

Musical Fidelity reserves the right to make improvements which may result in specification or feature changes without notice.

A308 CR

Dual Mono Power Amplifier

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