4
INTRODUCTION
Your MC450, MC650 or MC750 digitally controlled power amplifier represents the latest technology in
control circuitry coupled to a no compromise high quality class AB power amplifier. There is no dynamic
switching of the audio or power rails (a very common method of achieving extra power at the expense of
audio quality) thus ensuring optimum sonic performance.
The digital control monitors the operating parameters and adjusts the amplifier to suit the conditions. Fan
speed and supply rails are varied as required to keep the amplifier within its temperature limits. The levels
are adjusted by specially selected, high performance, digitally controlled attenuators. Signal limiters are
included, the attack and release times of which can be adjusted internally by the bit switches on the
control PCB (printed circuit board).
The amplifiers include full DC and short circuit protection which automatically re-connects when the fault
is cleared.
INSTALLATION
:
ELECTRICAL
The amplifier has been manufactured to comply with your local power supply requirements, but before
connecting the unit to the supply, ensure that the voltage (printed on the rear panel) is correct and that a
mains fuse of the correct type and rating has been fitted.
SAFETY WARNING
This unit is fitted with a 3 wire power cord. For safety reasons, THE EARTH LEAD SHOULD NOT BE
DISCONNECTED IN ANY CIRCUMSTANCE. If ground loops are encountered consult the section on
input connections later in this manual.
TO PREVENT THE LIKELIHOOD OF SHOCK OR FIRE HAZARD, DO NOT EXPOSE THE UNIT
TO RAIN OR MOISTURE.
TO AVOID ELECTRICAL SHOCK DO NOT REMOVE COVERS. REFER ALL SERVICING TO
QUALIFIED PERSONNEL.
INSTALLATION:
MECHANICAL
To ensure that this equipment performs to specification, it should be mounted in a suitable rack or
enclosure as described below. Like all high power amplifiers, it should be kept away from other
equipment which is sensitive to magnetic fields. Also, this amplifier may suffer a substantial reduction in
performance if it is subjected to, or mounted close to equipment which radiates high R.F. fields.
When mounting the amplifier in a rack or enclosure, ensure that :-
1. The rear of the unit is adequately supported. The brackets which are supplied fit standard 19 inch
(483mm) rack mounting systems. THE FRONT PANEL IS NOT CAPABLE OF SUPPORTING
THE UNIT ON ITS OWN.
2. THERE IS ADEQUATE VENTILATION. The cooling fans suck cool air in through the front air filter
and blow hot air out at the sides of the unit through the ventilating grills. IF THIS AIR IS NOT
ALLOWED TO ESCAPE, OVERHEATING WILL OCCUR. Take care when mounting other
equipment in the same rack. The air filter must be kept clean and free from dust. It is easily removed
by pulling it through the front. Dust can usually be shaken out, or if necessary the filter can be washed.
