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3. INSTALLATION
3.1. Location, assembly, ventilation
The APA600/1000/1400/2000 amplifiers are 2 RU high 19'' rack modules.
It is important that the amplifier, as a heat source, is not placed next to other
equipment nor exposed to high temperatures. Therefore, the ventilation path should be kept
free to allow fresh air entering the forced ventilation tunnel. This system takes air from the
unit's backside, bringing it directly to the power amp modules and distributing it to the
transformer and capacitors and then obliging it to pass trough the MOSFET cooling tunnel to
finally blow out of the front panel. In case of rack mounting, this system avoids heat
accumulation inside the unit and thus increases lifetime of electrolytic capacitors. It is
recommended to place power amplifiers on top of other equipment and not underneath.
All APA amplifiers are supplied with plastic washers in order not to damage the rack
ears when tightening the screws.
3.2. Mains connection
The APA amplifiers are fed with alternate currents, depending on the country, of
110-120, 220-240V 47/63Hz. (see characteristics in the back of the unit) consuming:
MODEL
CONSUMPTION
The mains cables must not be near the shielded cables carrying the audio signal, as this
could cause humming.
To protect the amplifier from eventual over charges of consumption, there are 5/9 time
lag fuses incorporated (see chart). Should a fuse blow, it must be replaced immediately by one of
identical characteristics. Should it blow again please consult our Technical Service Department.
NEVER REPLACE THE FUSE WITH ANOTHER ONE WITH A HIGHER VALUE.
CAUTION: Fuse substitutions have to be performed by a qualified technician.
FUSES
power module (5x20)
mains (6x32)
mains (10x38)
auxiliary supply (5x20)
3.3. Signal input connections
The signal input connectors are of XLR-3 type (19, 21), electronically balanced. The pin
assignment is as follows:
For unbalanced connection short-circuit pin 3 to pin 1.
6
APA600
830VA
APA600
T8A
T6.3A
--
--
HOT or direct signal
COLD or inverted signal
GROUND
APA1000
1250VA
APA1000
APA1400
T12A
T12A
T10A
T16A
--
--
--
--
APA1400
1720VA
APA2000
T12A
--
T16A
T250mA
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APA2000
3115VA
Pin 2
Pin 3
Pin 1
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