Mackie HD1531 Owner's Manual download pdf (Page 9)

Rigging Hardware and Accessories

Rigging Mackie loudspeakers will invariably require

hardware not supplied by Mackie. Various types of load-

rated hardware are available from a variety of third-

party sources. There are a number of such companies

specializing in manufacturing hardware for, designing,

and installing rigging systems. Each one of these tasks

is a discipline in its own right. Because of the hazardous

nature of rigging work and the potential liability, engage

companies that specialize in these disciplines to do the

work required.

Mackie does offer certain accessory rigging items,

primarily for attachment to the hardware integral with

the loudspeaker. Some items, such as eyebolts, may be

used with a variety of products. While these accessories

are intended to facilitate installation, the wide variety of

possible installation conditions and array conﬁgurations

do not permit Mackie to determine their suitability or

load rating for any particular application.

Mackie is not in the business of providing complete

rigging systems, either as designers, manufacturers, or

installers. It is the responsibility of the installer to pro-

vide a properly engineered, load-certiﬁed rigging system

for supporting the loudspeaker from structure.

Rigging Notes

The HD1531’s intergral mounting points are designed

to support only the weight of their own loudspeaker

with suitable, external hardware. This means that each

HD loudspeaker must be supported independently of

any other HD loudspeaker and any other loads.

A minimum of two rigging points must be used to hang

an HD1531. More may be used for creating the desired

hanging angle as shown in the illustrations on page 8.

All mounting points are fully load bearing so any two

may be used for rigging; no mounting points are restrict-

ed to angle control only.

Thermal Considerations

The HD1531 has three powerful built-in ampliﬁers ca-

pable of producing a combined 900 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 mounted on a large heatsink,

which is cooled by convection where cool air is drawn

through its 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 positioning the HD1531, 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 sig-

nal and lighting the thermal LED. When the ampliﬁer

has cooled down to a safe operating temperature, the

thermal switch resets itself, and the HD1531 resumes

normal operation.

If the thermal switch activates frequently, try turning

down the level control a notch or two on the mixing con-

sole (or the back of the HD1531) to avoid overheating

the ampliﬁer. Be aware that direct sunlight and/or hot

stage lights may be the culprit of an ampliﬁer overheat-

ing.

AC Power

Be sure the HD1531 is plugged into an outlet that

is able to supply the correct voltage speciﬁed for your

model. If the voltage should drop below 95% of the spec-

iﬁed 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 am-

perage for all the components connected to it.

We recommend that a stiff (robust) supply of AC

power be used because the ampliﬁers place high cur-

rent demands on the AC line. The more power that is

available on the line, the louder the speakers 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 ampliﬁers.

Never remove the ground pin on the power

cord or any other component of the HD1531.

This is very dangerous.

Care and Maintenance

Your Mackie loudspeakers will provide many years of

reliable service if you follow these guidelines:

• Avoid exposing the loudspeakers 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 loud-

speakers 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 cab-

inet, particularly where the drivers are located.

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Mackie HD1531 Owner's Manual Page 9

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