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Pro II owner’s manual
p.8
installation
2
To ensure optimum
cooling of the amplifier,
periodically clean its fan
filters. These are removable
without tools.
Make certain that there is
enough space around the
front of the amplifier
to allow the heated air to
escape. If the amplifier is
rack-mounted, do not use
doors or covers on the front
of the rack; the exhaust air
must not be impeded
In racks with closed backs:
for every four amplifiers,
allow at least one standard-
rack-space opening in the
front of the rack.
a
cooling and ventilation
Pro II Series amplifiers use a twin-tunnel forced-air cooling system to main-
tain a low,even operating temperature.
Drawn in by dual 105
CFM (cubic feet-per-minute) DC fans on the rear panel,
air flows through the cooling fins of the channel heat-sinks,dissipating power
transistor heat
—then exhausts through the front panel slots.
Heat sink temperature-sensing circuits control the “intelligent” variable-
speed fans.Fan speed increases only as required by heat-sink temperatures
—
keeping fan noise to a minimum.
Under extreme thermal load, the fans will force a very large volume of air
through the heat sinks. If either heat-sink surpasses the maximum allowed
temperature, the sensing circuit will open the output relay,disconnecting the
load from that channel.
If the power supply overheats, another sensing circuit opens both channel
output relays,until it has cooled to a safe temperature.