ISP Technologies Tripower 900 - Manual (Page 6)

THERMAL CONDITIONS
The ISP Tripower 900 Series is capable of producing in excess of 900 watts at full power.
This generates heat that must be dissipated in order to maintain reliability and insure the
amplifier components stay within their operating temperature specs. To accomplish this the
amplifier is mounted on a heatsink that is exposed on the rear of the cabinet. Airflow is forced
through a bass port at the bottom of the fins of the rear heatsink via the air movement from
the 15” speaker. It is recommended that the fins have at least 6 inches of clearance from any
obstruction to allow proper ventilation to occur.
In addition the amplifiers are thermally protected internally via a thermal switch which will
attenuate the signal 40db if the heatsink temperature exceeds a certain temperature. When
the temperature drops below a certain point, full signal will be restored. Tests have shown
under extreme conditions that cycling will occur approx. (40 sec. ON, 20 sec. OFF)
Under extreme conditions, such as when ambient temperatures are too high (hot rooms,
extreme outdoor temperatures) it is recommended to use a fan on the fins to reduce the
cycling effects.
It should also be noted that a separate internal thermal breaker also protects the power
transformer. If the power transformer temperature reaches a critical point the internal
thermal breaker will open. The power LED on the front of the cabinet will go out and the
Tripower 900 will shut down for several minutes while the power transformer cools. If this
condition occurs simply reduce the signal level of the system. This will only occur if the
Tripower 900 is continually pushed into heavy distortion.
NOTE: The power transformer inside the Tripower 900 contains an enamel coating on the
wires. During the first several hours of heavy use the Tripower 900 may have a slight odor
caused by the enamel on the transformer wires heating.