Musical Fidelity Stereo Amplifier A5 CR User Manual

XX  
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.  
A5 CR Power Amplifier  
Instructions for use  
Page 1 of 7  
Issue 1 : November 2004  
 
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.  
A5 CR Power Amplifier  
Instructions for use  
Page 3 of 7  
Issue 1 : November 2004  
 
CONNECTIONS and FACILITIES  
INPUT B indicator LED  
POWER-on indicator LED  
POWER  
MUTE  
indicator LED  
INPUT A  
Input selector  
on / off switch  
indicator LED  
button (see page 5)  
FRONT PANEL  
REAR PANEL  
IEC mains power inlet socket  
loop-OUTPUT  
INPUT sockets  
RIGHT SPEAKER  
LEFT SPEAKER  
OUTPUT terminals  
sockets  
- see page 5  
OUTPUT terminals  
- see page 5  
A5 CR Power Amplifier  
Instructions for use  
Page 4 of 7  
Issue 1 : November 2004  
 
CONNECTIONS and OPERATION  
All input, output and power connections should  
be made with the mains power switched OFF.  
If in doubt about bi-amplification, please  
contact your dealer for advice.  
INPUT CONNECTIONS  
LOUDSPEAKER 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.  
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.  
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 A and B operation is not  
possible.  
Note: - the combined load impedance must not  
be less than 4 ohms.  
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  
A and B inputs.  
BEFORE SWITCHING ON. . . . .  
Plug the accessory IEC mains lead into the rear  
panel socket, then the other end into a  
convenient wall outlet.  
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-  
Turn the volume control on your pre-amplifier  
to minimum, and switch on its power.  
amplification” (see below).  
OPERATION  
Press the POWER switch button on the left-  
hand end of the front panel on the A5 CR Power.  
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.  
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.  
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.  
Select the required audio input source A or 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.  
(continued . . . )  
A5 CR Power Amplifier  
Instructions for use  
Page 5 of 7  
Issue 1 : November 2004  
 
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  
Plug in securely  
No power when POWER  
button is pressed  
Mains power plug is not fully  
inserted into rear socket  
No sound  
Tape monitor function has been Switch off tape monitor  
selected on the pre-amplifier  
Wrong connections between  
Check audio input lead  
input source and the A5 Power connections  
Speakers not connected, or  
incorrectly wired  
Check speaker cables  
Sound is not precise, lacking in Speakers are connected out of  
Ensure speakers are connected  
correctly  
bass and stereo image  
phase, i.e., connections to one  
speaker (+ and -) are reversed  
Hum  
Audio connector plug not fully Insert plug securely  
pushed in  
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.  
A5 CR Power Amplifier  
Instructions for use  
Page 6 of 7  
Issue 1 : November 2004  
 
A5CR  
.SPECIFICATIONS.  
POWER AMPLIFIER  
Output : Power :  
Voltage, RMS :  
255 Watts per channel into 8 Ohms (24dBW),  
416 Watts per channel into 4 Ohms  
45.2 Volts 20Hz to 20kHz  
Voltage, Peak-to-peak :  
Current peak-to-peak  
Damping factor :  
118.8 Volts  
200 Amps  
170  
Output devices per channel :  
8
Line inputs :  
Total harmonic distortion + noise,  
Signal / noise ratio  
Input sensitivity for 255 Watts into 8 Ohms  
Input impedance  
< 0.01% 20Hz to 20kHz  
> 109dB ‘A’-weighted  
1.5V  
100k Ohms  
Channel separation  
> 90dB typical  
Frequency response  
10Hz to 100kHz, +0, -1.5 dB  
Inputs :  
“A”  
“B”  
1 pair line level RCA connectors  
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 :  
Weight :  
100 / 115 / 230Volts AC 50 / 60Hz (factory pre-set),  
750 Watts maximum into 8 Ohms, 70 Watts idle  
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.  
A5 CR Power Amplifier  
Instructions for use  
Page 7 of 7  
Issue 1 : November 2004  
 

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