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. See the hookup diagrams starting on page 4.

Check to make sure that the support surface (e.g., floor, etc.) has the necessary mechanical characteristics 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 of producing 600 watts of rms power. As an amplifier 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 overheating the amplifier. Be aware that direct sunlight and/or hot stage lights may be the cause of an amplifier overheating.

AC Power

Owner’s

Be sure the HD1501 is plugged into an outlet that

 

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.

 

Be sure the electrical service can supply enough

Manual

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:

•Avoid exposing the subwoofers to moisture. If they are set up outdoors, be sure they are under cover if rain is expected.

•Avoid exposure to extreme cold (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.

•Use a dry cloth to clean the cabinets. Only do 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.

Owner’s Manual

11