Musical Fidelity A3.2 CR User manual

A3.2 CR Power Instructions for Use Page 1of 7
Issue 1: April 2002
A3.2 CR
DUAL MONO POWER AMPLIFIER
INSTRUCTIONS FOR USE
Thank you for purchasing the Musical Fidelity A3.2 CR Power Amplifier.
Used properly and carefully, it should give you many
years of outstanding musical reproduction.
Æsthetically, the A3.2 CR power amplifier is a perfect match
for the A3.2 CR preamplifier, A3.2 CD player and the A3.2 tuner.
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.
POWER
MUSICAL FIDELITY A3.2 DUAL MONO POWER AMPLIFIER
C R

A3.2 CR Power Instructions for Use Page 2of 7
Issue 1: April 2002
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 A3.2 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.

A3.2 CR Power Instructions for Use Page 3of 7
Issue 1: April 2002
GENERAL ADVICE
INSTALLATION PRECAUTIONS and USER INFORMATION
Your new A3.2 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 A3.2 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 A3.2 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 A3.2 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.

A3.2 CR Power Instructions for Use Page 4of 7
Issue 1: April 2002
CONNECTIONS AND
FACILITIES
RIGHT
INPUT RIGHT LOOP OUTPUT LEFT LOOP OUTPUT LEFT INPUT
MUSICAL FIDELITY
A3.2 DUAL MONO POWER AMPLIFIER
C R
MANUFACTURED IN ENGLAND BY MUSICAL FIDELITY
THISAPPLIANCE
MUST BE
EARTHED
CAUTION
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
POWER CONSUMPTION
600W
RIGHT SPEAKER
OUTPUT LEFT SPEAKER OUTPUT
+
-
-
+
-
-
+
+
IMPORTANT
50/60Hz
SERIAL NUMBER
1 2 3 4 5 6 7
Front panel layout
Back panel layout
1Right speaker outputs (two)
2Right input
3Right loop output (see page 5)
4Left loop output (see page 5)
5Left input
6Left speaker outputs (two)
7IEC mains inlet
POWER
MUSICAL FIDELITY A3.2 DUAL MONO POWER AMPLIFIER
C R
Power on
indicator LED Power on/off switch

A3.2 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 A3.2 CR Power amplifier can be used
with a preamplifier or any line level source
which has a volume control. We highly
recommend the matching A3.2 CR pream-
plifier available from Musical Fidelity.
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 Line Inputs. The
corresponding LOOP OUTPUT sockets
are directly connected inside the unit to
duplicate the line inputs. This is to enable
onward connection to another amplifier, for
example when used for “bi-amplification”.
For the best results we recommend that
you use either Musical Fidelity X-LINX
“no-nonsense” cables for this connection or
the highly rated Nu-Vista interconnects
with integral RFI suppression. Various
lengths are available in the Nu-Vista inter-
connect range.
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.
Issue 1: April 2002
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 A3.2 CR - the red POWER
LED will light to confirm that the unit is
ready for use.
Select the required audio input source on
your pre-amplifier, and advance the volume
control to obtain the preferred sound level.
CONNECTIONS and OPERATION

A3.2 CR Power Instructions for Use Page 6of 7
Issue 1: April 2002
TROUBLESHOOTING
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 A3.2 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 A3.2 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

A3.2 CR Power Instructions for Use Page 7of 7
Power output 130 Watts per channel into 8 Ohms
Total harmonic distortion < 0.01% 20Hz to 20kHz
Frequency response 10Hz to 20kHz ±0.1dB
Channel separation > 85dB 20Hz to 20kHz
Audio gain 30dB (31.5 times)
Input impedance 31K Ohm
Signal / noise ratio, reference full output > 105dB unweighted
> 120dB ‘A’- weighted
Power consumption 600 Watts maximum
Dimensions 440 mm wide
100 mm high including feet
395 mm deep including terminals
Power requirements 100 / 115 / 230V AC, 50 / 60Hz
(factory preset)
Weight 15 kg unit only, unboxed
17 kg in shipping carton
Standard accessories IEC type mains lead
Issue 1: April 2002
Musical Fidelity reserves the right to make improvements which may result in specification or feature changes without notice.
SPECIFICATIONS
A3.2 CR
POWER AMPLIFIER