Musical Fidelity Stereo Amplifier A32 CR User Manual

A3.2 CR  
DUAL MONO POWER AMPLIFIER  
C
R
MUSICAL FIDELITY A3.2 DUAL MONO POWER AMPLIFIER  
POWER  
INSTRUCTIONS FOR USE  
CR  
Thank you for purchasing the Musical Fidelity A3.2  
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.  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 1 of 7  
 
GENERAL ADVICE  
INSTALLATION PRECAUTIONS and USER INFORMATION  
CR  
Your new A3.2  
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.  
CR  
Only connect the A3.2  
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.  
CR  
There are fuses inside the A3.2  
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.  
CR  
If after-sales service is required, to help your dealer identify the A3.2  
the serial number located on the rear panel of the unit.  
amplifier please quote  
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.  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 3 of 7  
 
CONNECTIONS AND FACILITIES  
Front panel layout  
C
R
MUSICAL FIDELITY A3.2 DUAL MONO POWER AMPLIFIER  
POWER  
Power on  
indicator LED  
Power on/off switch  
Back panel layout  
1
2
3
4
5
6
7
Right speaker outputs (two)  
Right input  
Right loop output (see page 5)  
Left loop output (see page 5)  
Left input  
Left speaker outputs (two)  
IEC mains inlet  
1
2
3
4
5
6
7
POWER CONSUMPTION  
600W  
RIGHT SPEAKER  
OUTPUT  
LEFT SPEAKER  
OUTPUT  
RIGHT  
INPUT  
RIGHT LOOP  
OUTPUT  
LEFT LOOP  
OUTPUT  
LEFT  
INPUT  
-
-
+
-
-
+
+
MUSICAL FIDELITY  
C
R
+
A3.2 DUAL MONO POWER AMPLIFIER  
MANUFACTURED IN ENGLAND BY MUSICAL FIDELITY  
SERIAL NUMBER  
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.  
THISMAUPSPTLBIEANCEIMPORTANT  
EARTHED  
CC  
50/60 Hz  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 4 of 7  
 
CONNECTIONS and OPERATION  
All input, output and power connections  
BEFORE SWITCHING ON. . . . .  
should be made with the mains power  
switched OFF.  
Plug the accessory IEC mains lead into the  
rear panel socket, then the other end into a  
convenient wall outlet.  
INPUT CONNECTIONS  
Turn the volume control on your preampli-  
fier to minimum, and switch on its power.  
CR  
The A3.2  
Power amplifier can be used  
with a preamplifier or any line level source  
which has a volume control. We highly  
CR  
OPERATION  
recommend the matching A3.2  
pream-  
plifier available from Musical Fidelity.  
Press the POWER switch on the front  
CR  
panel of the A3.2  
- the red POWER  
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”.  
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.  
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.  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 5 of 7  
 
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:  
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  
been selected on the pre-  
amplifier  
Switch off tape monitor  
at the pre-amplifier  
Wrong connections between  
Check audio input lead  
connections  
CR  
pre-amplifier and the A3.2  
Speakers not connected, or  
incorrectly wired  
Check speaker cables  
The sound is not precise,  
lacking bass and stereo  
image  
Speakers are connected out of  
phase, i.e. connections to one-  
speaker (+ and -) are reversed  
Ensure method of conn-  
ection is the same for left  
and right speakers  
If none of these actions effect a cure, please contact your dealer, or an authorised Musical  
CR  
Fidelity service agent. Remember, never open the case of the A3.2  
self, as this will invalidate the guarantee.  
Power amplifier your-  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 6 of 7  
 
SPECIFICATIONS  
A3.2 CR  
POWER AMPLIFIER  
Power output  
130 Watts per channel into 8 Ohms  
Total harmonic distortion  
Frequency response  
Channel separation  
Audio gain  
< 0.01% 20Hz to 20kHz  
10Hz to 20kHz ±0.1dB  
> 85dB 20Hz to 20kHz  
30dB (31.5 times)  
Input impedance  
31K Ohm  
Signal / noise ratio, reference full output  
> 105dB unweighted  
> 120dB ‘A’- weighted  
Power consumption  
Dimensions  
600 Watts maximum  
440 mm wide  
100 mm high including feet  
395 mm deep including terminals  
Power requirements  
Weight  
100 / 115 / 230V AC, 50 / 60Hz  
(factory preset)  
15 kg unit only, unboxed  
17 kg in shipping carton  
Standard accessories  
IEC type mains lead  
Musical Fidelity reserves the right to make improvements which may result in specification or feature changes without notice.  
CR  
Issue 1: April 2002  
A3.2  
Power  
Instructions for Use Page 7 of 7  
 

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