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connecting the ENABLE OUT to the ENABLE IN of the next amplifier. A mating connector is
shipped with the amplifier.
13. FAN GRILL
A continuously variable-speed DC fan supplies cool air into the amplifier. Do not block this
intake! The fan operates only when the amplifier heat sinks require cooling.
OPERATION
AC MAINS CIRCUIT SIZE REQUIREMENTS
Power requirements for ICA
™
amplifiers are rated at “idle”, 1/8 power (“typical” music
conditions), 1/3 power, and maximum rated power. The maximum power current draw rating
is limited by the amplifier’s circuit breaker. Consult the specification sheet for the current that each
amplifier will demand. AC mains voltage must be the same as that indicated on the back of the
amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any
warranty. NOTE: Always turn off and disconnect the amplifier from the mains voltage before making
audio connections. As an extra precaution, have the input attenuators turned down during initial
power up.
COOLING REQUIREMENTS
ICA Series amplifiers use a forced-air cooling system to maintain a low, even operating
temperature. Cooling air is drawn by a continuously variable-speed fan mounted on the back
panel, and exhausts through slots on the front panel. The fan will remain inactive until internal
operating temperature rises above 45º C (113º F). Make sure there is enough space around the
back of the amplifier to allow air to enter. NOTE: If the amplifier is rack mounted, do not use doors
or covers on the front or back without pressurizing the back of the rack. Whatever type of rack you
are using, make sure that heated air can escape freely, and that there is no resistance to the intake
of cool air through the back grill. Intake and exhaust air must flow without resistance.
HIBERNATION
™
All ICA Series amps feature Hibernation circuitry. Current draw and thermal emissions are at a
minimum when the absence of input signal is sensed for more than a minute. Once signal is
present, Hibernation instantly restores the amplifier to normal. Current draw specifications while
Hibernation is active are included in specifications under Idle Current Draw.
THERMAL EMISSIONS
The system installer or designer should specify system cooling needs. Refer to the specifications at
the back of this manual for specific thermal emissions figures.
INPUT CONNECTIONS
The input connector accepts balanced and unbalanced audio signals. For use with an unbalanced
source, tie the inverting (-) input to ground by installing a jumper to the signal ground connection. If
the inverting input is left floating, a 6 dB loss in gain will result.
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