Introduction - Mackie HDA Owner's Manual

Introduction

While traditional point-and-shoot systems are great
for venues such as coffee houses and small clubs, they
do not have the output or throw to cover larger venues.
In order to compensate, venues often combine
loudspeakers to get more output and cover more
ground. The problem is that the output of these
traditional loudspeakers overlap and interfere. This
interference is both constructive and destructive; it
varies depending upon the listening position. For many,
what they hear is less than desirable, and for no one it is
exactly the same.
A line array solves this problem by effectively
channeling these interferences, directing the sound
where it is desired, and removing it from where it is not.
Today, line arrays are the loudspeaker format of choice
for high-profi le tours and large installs worldwide.
Unlike traditional point-and-shoot systems, line arrays
excel at providing high output, long throw and
directional coverage with good vertical pattern
control – all in a package that is highly confi gurable
and scalable.
But what is a line array system and how does it work?
In its simplest form, a line array is a group of closely
spaced loudspeakers arranged in a straight line. They
are designed such that constructive interference occurs
in front of the array of loudspeakers and destructive
interference occurs at the top and bottom. This is the
highly desirable vertical directivity for which line arrays
are known.
However, one shouldn't place just any 'ol loudspeaker
in a line and expect to get increased output and better
pattern control. In order to get good vertical pattern
control, a line array must be designed so the
transducers are positioned as close together as possible.
More specifi cally, the separation between the
transducers must be less than the wavelengths emitted
by them. This is easy to achieve for lower frequencies
with long wavelengths (e.g. 1 kHz is equal to
13.56 inches), but much more diffi cult with higher
frequencies (e.g. 10 kHz is equal to only 1.32 inches).
Line arrays achieve this tight spacing by using multiple
drivers and more complex mechanical designs. Even
then, it isn't practical to place drivers only an inch
apart. Therefore, additional acoustical magic is
employed in the horn design to fl atten the output of the
high frequency wave fronts so they combine
constructively. The result is high output and even
coverage.
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HDA
Well, if line arrays are so awesome, why even use
traditional loudspeakers any more? Simply because
line arrays aren't perfect for all situations. A line array
is best-suited to applications where broad horizontal
coverage is desired throughout a given space, combined
with long-throw and higher output. Small venues don't
always need the added size and output of a line array,
and many meeting rooms, halls and restaurants are
better served by distributed systems comprised of many
small point-and-shoot loudspeakers. Plus, the added
cost for the more complex acoustical and mechanical
design of a line array puts them out of reach of many
customers...until now.
The Mackie HDA brings this technology to you at a
price point never seen before.
HDA is a constant curvature line array. This means
that the physical angle of the loudspeaker matches the
acoustical angle. There is only one way to rig together
multiple HDAs, so it's easy to use. As more units are
added, the array provides additional vertical coverage
(plus more vertical directivity at lower frequencies)
and, of course, it's louder. HDA's integrated rigging
makes it perfect for use in large permanent installs,
tours and festivals where the system is fl own, or as
a high-output pole-mounted portable PA. HDA is as
versatile as your shows and will scale to fi t your needs
like no other system anywhere else.
There is a lot to digest, so grab a coffee, cozy up into
your favorite chair and learn all there is to know about
your new HDA system.
THE EVER-IMPORTANT INSTALLATION WARNING
WARNING: HDA loudspeakers are a wonderful
tool when utilized in installed and portable
PA systems. However, improper installation
may result in damage to the equipment, injury or even
death. Therefore, installation should only be done by
experienced, licensed professionals to ensure that the
loudspeakers are installed in a stable and secure way in
order to avoid any conditions that may be dangerous for
persons or structures.