Placement - Mackie SRM550 Owner's Manual

Placement

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.
These loudspeakers are designed to sit on the
floor or stage as the main PA, monitors [SRM550 /
SRM650], or fill speakers [SRM750]. Check to make
sure that the support surface (e.g. floor, etc.) has the
necessary mechanical characteristics to support the
weight of the loudspeaker(s).
They 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 loudspeaker.
When pole-mounting loudspeakers, be sure that they
are stabilized and secured from falling over or being
accidentally pushed over.
The SPM200 is a great option when using an
SRM subwoofer, as it allows for greater extension
than most other poles available north of the South Pole.
Please note that SRM750 loudspeakers
should not be pole-mounted via SPM200.
Instead, it should be stacked on top of the
subwoofer. It is highly suggested that straps are utilized.
To reiterate, failure to follow these precautions may
result in damage to the equipment, personal injury,
or death.
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SRM550 • SRM650 • SRM750 Powered Loudspeakers
These loudspeakers may also be flown via its fly
points as detailed on pages 16–17. Be sure to read the
PA-A2 Eyebolt Installation Instructions, as well.
These loudspeakers are NOT designed to array
horizontally. If you feel you must put two speakers
side-by-side, 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
loudspeaker; the interference between the two cabinets
will be minimized, but the total coverage of 180˚ may
be too wide for some applications. 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 nearfield 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.
To reiterate, though, we strongly suggest
NOT arraying these loudspeakers horizontally.
Experimentation and experience will help you find
the right trade-off for your application.