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7
INSTALLATION
Rack Mounting
The SPA Series amplifiers are designed for standard 19”
rack mounting as well as “stack” mounting without a
cabinet. Use 4 screws and washers for mounting to the
front rack rails. It is also a good idea to support the amps
also in the rear, especially for mobile use where the amps
will be subjected to shocks.
Amplifier Cooling
Also pay close attention to the cooling requirements. Since
the airflow is from the rear to the front, it is important to
keep both the inlet in the rear and the output in the front
clear of obstructions to enable efficient cooling airflow.
Since the amp exhausts to the front it does not contribute
to heat buildup in the rear of the rack. It is important,
however, that the other devices used in the rack allow
plenty of cool air in the rear to enable proper cooling of the
amp. Never block the air vents in the sides and front of the
amplifier if the load seen by amplifier is less than 4 ohms
and the amplifier is being run at high output levels. For
best results, in such high output power applications you
should augment the amplifier’s air flow with a rack cooling
system.
Internal Fuse Protection
Each of the SPA Series amplifiers has backup internal
fuse protection on each channel on the secondary output
circuitry of the power transformer. In almost all cases of
power overload the external back panel circuit breaker,
which is wired in the primary power input circuit of the
power transformer, will trip before the internal fuses blow.
Nevertheless, these fuses are valuable in that they can
sometimes isolate the problem to a single channel,
allowing operation of the other channel. Also, because
they require added effort to rectify, they increase the
vigilance of the operator in correctly eliminating the cause
of the overload problem before further use. These fuses
are located inside the units and require removal of the top
of the chassis.
CAUTION: Never open the unit when connected to AC
power as you can be severely shocked resulting in serious
injury or even death. Please wait at least 5 minutes after
disconnecting the unit from AC power to let any internal
capacitors discharge before opening. )
Replace the fuse with the same type, size and power
rating as noted in the illustration for your SPA Series amp.
If it continuously blows, stop replacing the fuse and refer
servicing to qualified personnel.
Internal Fuses for SPA 850/1400
Internal Fuses for SPA 2400
SPA 850 10A/250V (x2)
SPA 1400 12A/250V (x2)
both 3AG Fast Blow
SPA 2400 25A/250V (x2)
both 3AG Fast Blow