+SACD Musical Fidelity Stereo Amplifier Class A Integrated A300int Eng

User Manual: Musical Fidelity Stereo Amplifier Class A Integrated Amplifier

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INTRODUCTION

A300
DUAL MONO INTEGRATED AMPLIFIER

INSTRUCTIONS FOR USE
Thank you for purchasing the Musical Fidelity
A300 remote control integrated Amplifier.
Used properly and carefully, it should give you many
years of outstanding musical reproduction.

The A300 operates in Class A/B which in our experience
offers the ultimate in musical accuracy and pleasure.
The A300 is based on ideas and principles developed
in the legendary XA1 Integrated amplifier
but with subtle changes and improvements.

Aesthetically, the A300 is a perfect match for the
A3 CD player and the A3 FM Tuner.
Together, they form one of the finest hi-fi systems
that you can own today.

Dust regularly with a soft duster or soft brush but be
careful using cleaning or polishing agents - they may
harm the surface finish.
If you have any questions about anything in your
audio system, please consult your dealer who is there to
help and advise you.

issue 3/13.07.2000

A300

Instructions for Use. Page 1 of 9

SAFETY INFORMATION
IMPORTANT!
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 observe the following safety precautions.
Please dispose of the cut-off plug safely. It must not be plugged into a mains power supply.
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 - Radio Frequency Interference (RFI)
This hi-fi product has been tested to ensure that its operation will not be adversely affected by
normal background levels of RFI. It is possible that if this product is subjected to abnormally
high levels of RFI the unit may be susceptible and not perform as expected. In the unlikely
event of this happening on a regular basis, please contact Musical Fidelity's service department.
The unit has also been tested to ensure that it does not radiate excessive levels of RFI that could
affect other pieces of electronic or electrical equipment.
The electronics in modern hi-fi equipment is complex and hence may be damaged by lightning.
It is possible that during electrical storms the operation of some equipment may be adversely
affected. For complete protection of your hi-fi system during such storms, mains plugs and aerial leads should be disconnected.
Always ensure that when disconnecting and re-connecting your hi-fi equipment the mains
supply is switched off.

issue 3/13.07.2000

A300

Instructions for Use. Page 2 of 9

GENERAL ADVICE
INSTALLATION PRECAUTIONS and USER INFORMATION
Your new A300 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 on the back of the unit.
Only connect the A300 to a mains outlet of the voltage marked on the back of the unit.
Position the mains lead, speaker leads and signal interconnects where they are not likely
to walked on or trapped by items placed on them.
Do not use near water.
Do not place the unit near direct heat sources such as radiators or other equipment that
produces heat.
Do not place the unit where it can be subjected to direct sun-light.
Do not remove any covers or try to gain access to the inside. The warranty is invalid if
the unit has been tampered with. There are no user adjustments within. Refer all service
work to an authorised Musical Fidelity agent.
Dust regularly with a soft duster or soft brush but be careful when using cleaning or
polishing agents - they may harm the surface finish.
There are fuses in the A300. In the unlikely event that one blows, take your unit to your
audio dealer. Do NOT try to replace the fuse yourself or you will invalidate the warranty.
The remote control enables you to activate the main functions of the amplifier from the comfort
of your armchair. The following should be noted when operating the amplifier using the remote
control.
- Point the remote control (transmitter) towards the I.R. lens (infra red) on the amplifier.
- Visual contact must exist between the transmitter and receiver.
- If the range of the remote control decreases dramatically, replace the
batteries with new ones.
Before Switching on the Stereo System
Please read carefully the instructions on the following pages. The functional arrangement of
the controls makes the stereo system fairly easy to operate. You should nevertheless study
these instructions to get the best from your equipment.
Important! Unauthorised opening of the equipment will invalidate any warranty claims.
Note: To help your dealer identify your amplifier if after-sales service is required, please quote
the serial number located on the rear panel of the unit.

issue 3/13.07.2000

A300

Instructions for Use. Page 3 of 9

CONNECTIONS AND FACILITIES

PHONO

POWER

1

2

3

5

SACD

12

13

14

4

6

TAPE

TAPE MONITOR

7

8

9

11

10

A300 back panel layout
12
13
14
15
16
17
18
19
20
21
22
23
24

Power on indicator LED
Power on/off switch
Volume control
Infra red receiver
Phono input select button and LED
CD input select button and LED
Tuner input select button and LED
AUX input select button and LED
SACD input select button and LED
TAPE input select button and LED
Tape monitor button and LED

15

16

A300

RIGHT speaker output
Phono earth connection
MM/MC selection switch
Phono input
CD input
Tuner input
AUX input
SACD input
TAPE input
TAPE RECORD output
PREAMP output
LEFT speaker output
IEC mains inlet

17 18 19 20 21 22

AUX

issue 3/13.07.2000

AUX

I R RECIEVER

A300 front panel layout
1
2
3
4
5
6
7
8
9
10
11

TUNER

CD

23

24

SACD

Instructions for Use. Page 4 of 9

CONNECTIONS
LOUDSPEAKERS

BEFORE YOU SWITCH ON

To get a realistic soundstage and full
dynamic range from your A300, use it with
loudspeakers of a reasonable efficiency
and high power handling. We recommend
power handling of at least 150W. An average rating for a loudspeaker these days is
about 88dB. This should mean that for an
input of 1 watt, measured at 1 metre distance, the sound pressure output will be
88dB. This is the minimum efficiency that
we recommend you should use.

You should make all connections to the
A300 before switching on.
Follow this routine before you listen for
the first time, and each time you change
any connections.
1

Check all the inputs and outputs to
the A300.

2

Then check again.

3

Turn the volume control to
minimum.

4

Now you can switch on the power
and carefully advance the volume to
the level you want and enjoy the
music.

WARNING
THE A300 IS A POWERFUL
AMPLIFIER AND IS DESIGNED
TO SUPPLY HIGH VOLTAGES
AND HIGH CURRENTS
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.

CONNECTIONS
All connections should be made with the
power OFF.
The A300 has 1 phono input which can be
used for either moving magnet (MM) or
moving coil (MC) cartridges.
The A300 also has 5 line level inputs CD, Tuner, Aux, SACD, and Tape.
All line level inputs are electrically identical and are suitable for use with any source
component with an output voltage in the
hundreds of millivolts (mV). This includes
CD players, Super Audio CD players
(SACD), tuners, tape machines and the
audio outputs of video recorders, televisions, DVD and LaserDisc players etc.

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A300

Instructions for Use. Page 5 of 9

OPERATION
PREAMP OUTPUT

REMOTE CONTROL

The A300 has a permanently active preamp output situated on the back panel.
This provides extra flexibility for use in
multi-room or surround-sound systems etc.
This signal comes from the A300's internal
preamp and its output level is thus controlled by the front panel volume control.

The A300 features Infra Red remote control of volume, input selection and mute
functions via the supplied remote control
handset. The Infra Red receiver is the
small red lens marked I.R.Receiver. situated on the front panel. It is important to
ensure that when operating the remote control, the line-of-sight from the remote to
the infra red receiver is not obstructed.

This output allows easy upgrading by passive bi-amping with a pair of X-A50s or
X-A200s.

Pressing the volume up or down buttons on
the remote handset will advance the
motorised volume control in the desired
direction.

To bi-amp (which requires bi-wireable
speakers) an extra pair of X-ponent amplifiers is attached to this permanent preamp
output.

Input selection can also be controlled with
the remote handset.

The A300's built in power amps can then
for instance drive the left and right channel
tweeters whilst the X-A50s or X-A200s
drive the left and right channel bass units.

The mute button on the remote handset
mutes the output. To show the amplifier is
muted the red LED in the volume control
goes out. Press the mute button again to
switch the mute off, the red led will light
again.

Passive bi-amping in this way can give
noticeable gains in clarity, imaging and
bass weight.
If you would like further details please
contact your dealer or Musical Fidelity
directly.

issue 3/13.07.2000

A300

Instructions for Use. Page 6 of 9

OPERATION
PHONO

OFF TAPE MONITORING

The A300 has a phono input for turntables
fitted with either a moving magnet cartridge (MM) or a moving coil cartridge
(MC). Use the MM/MC push button
switch to select the type of cartridge that is
fitted to you turntable.

In conjunction with a 3-head cassette deck,
off-tape monitoring allows the user to
compare the recorded to original sound
whilst a recording is made. To do this,
first select the required source in the normal way and start recording. The Tape
Monitor button on the front panel can now
be used to switch between the source signal and the recorded signal allowing direct
comparison.

IMPORTANT NOTE Do not operate
the MM/MC switch with the volume
turned up.
Some turntable/pick-up arm combinations
are fitted with an extra wire called a chassis earth, which should be connected to the
green gold terminal on the back of the
amplifier.

The red LED just above the tape monitor
button indicates that tape monitor is selected.
Note that tape (the recorded signal) is
selected when the LED is lit. On some 3head cassette decks there is an additional
'tape/source' switch which will need to be
in the 'tape' position for the above to work

TAPE RECORDING
The A300 has a single tape circuit with
facilities for off-tape monitoring with 3head cassette decks.

If you are in any doubt consult your tape
machine's manual.

Connection of your tape machine to the
A300 should be as follows. The tape
machine's Tape/Line outputs go to the
A300's 'Tape' input sockets.
The tape machine's Tape/Line inputs go to
the A300's 'Tape Record' output.
To record, simply select the required
source with the source selector button on
the front panel. The selected source will
now be sent to the 'Tape Record' output for
recording by the attached tape machine.
You will also be able to hear the selected
source through the loudspeakers.
Note - you can adjust the listening level
with the volume control without affecting
the recording level.

issue 3/13.07.2000

A300

Instructions for Use. Page 7 of 9

TROUBLESHOOTING
Basic troubleshooting of an amplifier is similar to troubleshooting of 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:

Problem

Probable Cause

Remedy

No power when POWER
is pressed

Mains plug not inserted
correctly

Plug in securely

No sound

Volume control is set
to minimum

Turn up the volume

Wrong input selected

Select correct input

Mute is selected

Press mute button on
remote control

Unit has not yet come out
of power-up mute

Wait 10-15 seconds on
power-up for unit to
un-mute

Tape Monitor button is
depressed

Press Tape monitor
button

Speakers are not connected, Check speaker cables
or are connected incorrectly
Sound is not precise,
lacking in bass and
stereo image

Speakers are connected
out of phase

Make sure that both
speakers are connected
correctly

Remote control unit will
not operate

POWER switch set to OFF

Set switch to ON

Batteries not inserted in
remote control unit

Insert batteries

Batteries flat

Change batteries

Remote control not pointed at Ensure line of sight
IR receiver lens
between remote control
and IR receiver lens is not
obstructed
Range of remote control
has dramatically reduced

Batteries running out

Change batteries

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 A300 yourself, as this will invalidate the guarantee.

issue 3/13.07.2000

A300

Instructions for Use. Page 8 of 9

SPECIFICATIONS

A300
INTEGRATED AMPLIFIER
Power Output

150 watts per channel into 8 Ohms
260 watts per channel into 4 Ohms

THD

< 0.008% at 1KHz
< 0.005% at 1KHz (‘A’ weighted)

Frequency response

20Hz - 20KHz +0.5dB

Inputs

1 phono 5 line level

Outputs

Speaker outputs, Tape out, Preamp out.

Input sensitivity (line inputs)
Input sensitivity (MM input)
Input sensitivity (MC inputs)

300mV (for full output)
3.5mV (for full output)
350uV (for full output)

Input impedance (line inputs)

100KOhm

S/N Ratio (line inputs)

> 83dB ‘A’ weighted (Ref 1W)
> 100dB ‘A’ weighted (Ref 150W)
> 78dB ‘A’ weighted (Ref 1W)
> 82dB ‘A’ weighted (Ref 150W)
> 70dB ‘A’ weighted (Ref 1W)
> 73dB ‘A’ weighted (Ref 150W)

S/N Ratio (MM)
S/N Ratio (MC)

Power consumption

600W Max

Dimensions

Amplifier 440 x 116 x 400mm (W x H x D)
Height includes feet, Depth includes terminals

Power requirements

100/115/230V AC 50/60Hz
(Factory preset)

Weight

16 kg (un-boxed)

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

issue 3/13.07.2000

A300

Instructions for Use. Page 9 of 9



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