Mackie HD1221 Car Speaker User Manual


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WARNING:Installationshouldonlybedoneby
anexperiencedtechnician.Improper
installation may result in damage to the
equipment, injury or death. Make sure that the
loudspeaker is installed in a stable and secure way in
order to avoid any conditions that may be dangerous for
persons or structures.
The HD1221 speaker is designed to sit on the floor or
stageasthemainPAorasmonitors.Itmayalsobepole-
mounted via the built-in socket on the bottom of the
cabinet.Besurethepoleiscapableofsupportingthe
weightoftheHD1221.TheMackieSPM200isagreat
option when using a sub. The HD1221 may also be flown
horizontallyorverticallyviaits12integratedypoints
as detailed on page 11.
Check to make sure that the support surface
(e.g.,oor,etc.)hasthenecessarymechanical
characteristics to support the weight of the
loudspeaker(s).
When pole-mounting loudspeakers, be sure that they
arestabilizedandsecuredfromfallingoverorbeing
accidentally pushed over. 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 loudspeaker in places
exposedtoharshweatherconditions.Ifyouaresetting
them up outdoors, make sure they are under cover if you
expect rain.
Placement
180˚
Youcancreateahorizontalarraybyplacingthe
cabinets side-by-side. However, you should have a good
understanding of the relationship between the splay
angle(theanglebetweenthefacingsidesofthe
cabinets)andfrequencycancellationeffectsbetween
cabinets.
When two cabinets are positioned side-by-side such
that the rear-angled faces of the enclosures are
parallel,thesplayanglewillbe90º.Thismatchesthe
90˚horizontalcoveragepatternofeachindividual
HD1221; the interference between the two cabinets will
beminimized,butthetotalcoverageof180˚maybetoo
wideforsomeapplications(seeFigureA).Themidand
high frequencies may also be reduced for those in the
center who are too close to the loudspeakers.
Reducing the splay angle will reduce the total
horizontalcoverage,butitalsocreatesanareaboth
speakersarecovering.Insteadofaneareldhole,
this will cause comb-filtering effects in the frequency
response in the overlapping area. The smaller the splay
angle, the more energy will be delivered on-axis, but the
comb-filtering effects will get worse at the same time
(seeFigureB).
Experimentation and experience will help you find
therighttrade-offforyourapplication.Intheend,the
correct placement will depend on the environment and
the necessary audience coverage.
Two HD1221s horizontally arrayed with 180˚
coverage with no interference.
Two HD1221s horizontally arrayed with 110˚
coverage with center interference.
110˚
Interference
9
Owner’s Manual
Owner’s Manual
Figure BFigure A
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