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6
PLACEMENT
The SRS1500 subwoofer is designed to
sit on the floor or on sturdy stands.
A socket is provided on the top of the
SRS1500 for mounting the Mackie
SRM450 active speaker. Use the optional
Mackie speaker mounting pole to mount
the SRM450 on the SRS1500 (see Hookup
Diagram on page 5).
As with any powered
components, protect
them from moisture. If
you are setting them up
outdoors, make sure they
are under cover if you
expect rain.
AC POWER
Be sure the SRS1500 is plugged into an
outlet that is able to supply the correct volt-
age specified for your model. If the voltage
should drop below 97% of the specified line
voltage, the built-in amplifiers will no
longer be able to supply rated power. (They
will continue to operate down to 80% of
the rated line voltage, but won’t reach full
power, resulting in lower headroom.)
Be sure the electrical service can supply
enough amperage for all the components
connected to it.
We recommend that a stiff (robust) sup-
ply of AC power be used because the
amplifiers place high current demands on
the AC line. The more power that is avail-
able on the line, the louder the speakers will
play and the more peak output power will
be available for cleaner, punchier bass. A
suspected problem of “poor bass perfor-
mance” is often caused by a weak AC
supply to the amplifiers.
Never remove the
ground pin on the power
cord of the SRS1500 or
any other component.
This is very dangerous.
THERMAL
CONSIDERATIONS
The SRS1500 has a powerful 600 watt
amplifier built-in. As amplifiers produce
heat, it is important to dissipate the heat as
quickly as possible. This results in in-
creased 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 it’s
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 SRS1500, 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, muting the signal and causing the
THERMAL indicator on the rear panel to
light. When the amplifier has cooled down
to a safe operating temperature, the thermal
switch resets itself, the THERMAL LED
turns off, and the SRS1500 resumes normal
operation.
If the thermal switch activates frequently,
try turning down the level control a notch
or two on the mixing console (or other sig-
nal source) or on the subwoofer itself to
avoid overheating the amplifiers.
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
across the heatsink panel.
SERVICE INFORMATION
Warranty Service
If you think your subwoofer has a prob-
lem, please do everything you can to
confirm it before calling for service, includ-
ing reading through the following
Troubleshooting section. Doing so might
save you from being deprived of your
Mackie loudspeaker.