Mackie HD1521 Manuel du propriétaire télécharger pdf (Page 11)

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 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

ofproducing600wattsofrmspower.Asanamplier

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amplier.Beawarethatdirectsunlight

and/orhotstagelightsmaybethecauseofanamplier

overheating.

AC Power

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

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

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Mackie HD1521 Manuel du propriétaire Page 11

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