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8
5000 watts of power. This provides the
headroom necessary to deal with the peak
transient signals that must be reproduced.
The AC current supplied to the active
speaker is especially critical to the overall
performance of the audio system. In light of
the limitations created by standard 115V
service, we have a list of suggestions that
will help you avoid problems.
AC Recommended Checklist
• Always check your installation/set up
for available AC supply rated circuit
amperage
• Locate the main electrical board for
breaker location
• Make sure you are not sharing the
AC supply for amplifiers with lighting
or other services
• Whenever possible, specify 20 amp
(15 minimum) service for individual
boxes
• Use 16 gauge AC cable as a minimum
standard.
The 230 volt AC systems are more
stable and run into far fewer current supply
problems. In fixed applications where 220-
230 volt service is available, we highly
recommend using the SA1232 in 230 volt
mode. The power supply in the SA1232 can
be switched between 115 volt and 230 volt
setting. Contact your local service center or
Mackie Designs for information.
THERMAL
CONSIDERATIONS
The SA1232 has three powerful built-in
amplifiers capable of producing a combined
1300 watts of power. As amplifiers produce
heat, it is important to dissipate the heat as
quickly as possible. This results in increased
reliability and longevity for the amplifier.
The amplifier module is mounted on a
large heatsink, which is cooled by convec-
tion where cool air is drawn through its
fins, carrying the heat away. In order for
this convection cooling to work efficiently,
it is important to provide adequate airspace
behind the loudspeaker. When you position
the SA1232, we recommend leaving at least
six inches of air space behind it.
In the unlikely event of the amplifier
overheating, a built-in thermal switch will
activate, which mutes the signal and lights
the
THERMAL
LED. When the amplifier
has cooled down to a safe operating tem-
perature, the thermal switch resets itself,
and the SA1232 resumes normal operation.
If the thermal switch activates frequently,
try turning down the level control a notch or
two on the mixing console (or the back of the
SA1232) to avoid overheating the amplifier.
If the temperature in the room is too
high, it could cause the amplifier to over-
heat. In this case, you should try aiming a
fan at the rear panel to move more air
through the fins.