Rigging - Mackie SRM450v2 Owner's Manual

Here are some other placement tips:
• Avoid placing loudspeakers in the corners of a room.
This increases the low-frequency output and can cause
the sound to be muddy and indistinct.
• Avoid placing loudspeakers against a wall. This, too,
increases the low frequency output, though not as
much as corner placement. However, if you do need to
reinforce the low frequencies, this is a good way to do it.
• Avoid placing the active speakers directly on a
hollow stage floor. A hollow stage can resonate at
certain frequencies, causing peaks and dips in the
frequency response of the room. It's better to place
the active speakers on a sturdy table or tripod stands.
• Position the active speakers so the high-frequency
drivers are two to four feet above ear level for the
audience (make allowances for a standing/dancing
in the aisles audience). High frequencies are highly
directional and tend to be absorbed much easier than
lower frequencies. By providing direct line-of-sight
from the active speakers to the audience, you increase
the overall brightness and intelligibility of the sound
system.
• Highly reverberant rooms, like many gymnasiums and
auditoriums, are a nightmare for sound system
intelligibility. Multiple reflections off the hard walls,
ceiling, and floor play havoc with the sound. Depending
on the situation, you may be able to take some steps
to minimize the reflections, such as putting
carpeting on the floors, closing draperies to cover large
glass windows, or hanging tapestries or other materials
on the walls to absorb some of the sound.
However, in most cases, these remedies are not possible
or practical. So what do you do? Making the sound
system louder generally doesn't work because the
reflections become louder, too. The best approach is to
provide as much direct sound coverage to the audience
as possible. The farther away you are from the speaker,
the more prominent will be the reflected sound.
Use more speakers strategically placed so they are closer
to the back of the audience. If the distance between the
front and back speakers is more than about 100 feet, you
should use a delay processor to time-align the sound.
(Since sound travels about 1 foot per millisecond, it
takes about 1/10 of a second to travel 100 feet).

RIGGING

The SRM450v2 cabinets are fitted with ten rigging points
as shown in the diagram below. These are M10 inserts. M10
threaded eyebolts (M10 x 1.5 mm x 20 mm) are available to
fit these inserts (PA-A1 Eyebolts).
WARNING: Never attempt to suspend
the SRM450v2 active speakers by their
handles. If you want to suspend them,
use the rigging points only. Consult a
professional rigger or structural
engineer prior to suspending loudspeakers from a structure
not intended for that use. Always know the working load
limit of the structure supporting the loudspeaker array.
Always make sure that the rigging hardware minimum
rating is at least five times the actual load.
Back
Pole
Rigging Points
Mount
Top
If you are hanging them in an
inaccessible place, such as over a lion's
cage, make sure that you first complete
the sound check and set the SRM450v2
LEVEL correctly. Also set the TIMED
TURNOFF switch if you want the SRM450v2 to turn on
when there is a signal present. It will also turn off after
three or more minutes of silence.
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