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Placement
The HD1501 subwoofer is designed to sit on the floor
or stage. A socket is provided on top of the HD1501 for
mounting other Mackie loudspeakers. Use the optional
Mackie speaker mounting pole to mount them on the
HD1501.Seethehookupdiagramsstartingonpage4.
Check to make sure that the support surface (e.g.,
floor, etc.) has the necessary mechanical characteris-
tics to support the weight of the loudspeaker(s) and
subwoofer(s).
When pole-mounting loudspeakers, be sure that the
HD1501 subwoofers are stabilized and secured from
falling over or being accidentally pushed over. For
stacked scenarios, it is highly suggested that straps are
utilized. Failure to follow these precautions may result
in damage to the equipment, personal injury, or death.
As with any powered components, protect them from
moisture. Avoid installing the subwoofer in places
exposed to harsh weather conditions. If you are setting
them up outdoors, make sure they are under cover if you
expect rain.
The cabinet has no rigging points and is not
suitable for rigging. Never attempt to suspend
the HD1501 by its handles.
Thermal Considerations
The HD1501 has a powerful built-in amplifier capable
ofproducing600wattsofrmspower.Asanamplier
works, it produces heat. The higher the signal level, the
louder and hotter it gets. 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 cooled by twin
thermally-controlled vari-speed fans. In order for this
convection cooling system to work efficiently, it is
important to provide adequate airspace behind the
subwoofer. When positioning the HD1501, 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
amplifier’s output. When the amplifier has cooled down
to a safe operating temperature, the thermal switch
resets itself, and the HD1501 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 HD1501) to avoid
overheatingtheamplier.Beawarethatdirectsunlight
and/orhotstagelightsmaybethecauseofanamplier
overheating.
AC Power
BesuretheHD1501ispluggedintoanoutletthat
is able to supply the correct voltage specified for your
model. It will continue to operate at lower voltages, but
will not reach full power.
Besuretheelectricalservicecansupplyenough
amperage for all the components connected to it.
We recommend that a stiff (robust) supply of AC
power be used because the amplifier places high
current demands on the AC line. The more power that is
available on the line, the louder the subwoofer will play
and the more peak output power will be available for a
cleaner, punchier bass. A suspected problem of “poor
bass performance” is often caused by a weak AC supply
to the amplifier.
Never remove the ground pin on the power
cord or any other component of the HD1501.
This is very dangerous.
Care and Maintenance
Your Mackie subwoofers will provide many years of
reliable service if you follow these guidelines:
• Avoidexposingthesubwooferstomoisture.If
they are set up outdoors, be sure they are under
cover if rain is expected.
• Avoidexposuretoextremecold(below
freezing temperatures). If you must operate the
subwoofers in a cold environment, warm up the
voice coils slowly by sending a low-level signal
through them for about 15 minutes prior to
high-power operation.
• Useadryclothtocleanthecabinets.Onlydo
this when the power is turned off. Avoid getting
moisture into any of the openings of the cabi-
net, particularly where the driver is located.
11
Owner’s Manual
Owner’s Manual