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SP1200 – 15
AC Power Considerations
Each SP1200 draws an average of 3 amps of AC
line current (@ 120VAC) when fully loaded and
playing music with a relatively high crest factor.
Voltage Conversion
The SP1200 can be configured to operate at
115V AC or 230V AC. See Appendix C for instructions
on how to change the operating voltage configuration.
Thermal Considerations
IMPORTANT: The SP1200 is convection
cooled rather than fan cooled. This design
was chosen to avoid the requirement for
periodic air filter maintenance, and to keep the
insides of the SP1200 clean in dirty environments.
This avoids blowing dirty, smoky air into it. Heat is
drawn away from the amplifiers by the heatsinks
and radiated through the cooling vents in the top
cover. When installing the SP1200, be sure to allow
sufficient air space around the top and rear of the
amplifier to allow adequate cooling for the
heatsinks. If installing in a rack,
leave at least one
rack space above and below the SP1200 for a vent,
and at least 6 inches behind the chassis to allow
proper ventilation.
If installing three or more SP1200s in a rack, use a
fan in the rack to move cool air in and warm air out of
the rack's enclosure. It may be necessary to provide
a cool air intake fan at the bottom of the rack, and a
warm air exhaust fan at the top (see Figure below).
If the amplifier should overheat, a thermal switch
is activated that disengages the speaker output,
allowing the heatsink to cool down. The
OVERLOAD
indicator on the front panel will also light to show
that a protection circuit has been activated. Once
the amplifier has cooled to a safe operating tem-
perature, the thermal switch resets and reactivates
the speaker output. If this should occur, identify the
cause of the problem and take corrective action,
such as providing better ventilation, installing a fan
in the rack to move more air, making sure the
amplifier is not overloaded with too low of a load
impedance, etc.
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1U Vent Panel
1U Vent Panel
2U Vent Panel
(or Optional Intake Fan)
2U Exhaust Fan Panel
Cool Air
Intake
Cool Air
Intake
Cool Air
Intake
Cool Air
Intake
Cool Air
Intake
Hot Air
Exhaust