Meyer Sound UPA-1P - Manual (Page 7)

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a safe level to prevent the system from overheating. Under
high temperature conditions the output level is reduced
6 dB. When the heatsink temperature decreases to 75°C
(167°F), the On/Temp. LED changes from red to green
and the limiter threshold returns to normal.
The heatsink reaches temperatures up to 185 ° F
(85 ° C) during normal operation. Use extreme
caution when approaching the rear of the cabinet.
Fan Assembly Kit
While convection cooling is adequate for most applica-
tions, in situations where the UPA-P is driven into con-
tinuous limiting under severe temperature conditions,
or where ventilation is restricted, we recommend the in-
stallation of an optional fan kit to maintain a safe operat-
ing temperature.
The easy-to-install fan, powered through the 24V Fan
connector on the rear panel, blows air directly onto the
heatsink. The fan speed increases as the heatsink tem-
perature rises, which maintains a safe operating tem-
perature with minimal fan noise. Contact Meyer Sound
to order the fan kit.
Power Supply Fan
The power supply is cooled by a single small internal fan
that turns on low when the unit is first powered up. The
fan doubles its speed as the system is driven with audio.
Since the fan draws air in from, and exhausts it at the
back of the cabinet, there must be at least six inches
clearance behind the cabinet, and adequate air flow.
Rigging
The UPA-P weighs 77.5 lb (35.2 kg). The maximum rec-
ommended load for an UPA-P with aircraft pan fittings
is 420 lb (191 kg). This working load is based on a 5:1
safety factor. The UPA-P has four rigging brackets (two
on top, two on bottom of the cabinet); each bracket is
capable of supporting the full working load of the cabinet.
There are four types of interchangeable rigging brackets,
each fastened by six Phillips screws:
• aircraft pan fittings (ring and stud)
• 3 /
8
”-16 nut plates
• M-10 x 1.5 metric nut plates
• blank plates (if no rigging brackets are requested)
NOTE: Units with nut plates are rated for the weight of one
cabinet only.
Rigging load ratings assume a straight tensile pull and
that the cabinet is in new condition with aircraft pan
fittings. If these conditions are not met, the load ratings
can be reduced significantly. Load ratings can also be
reduced by age, wear, and damage. It is important to
inspect the rigging hardware regularly and replace worn
or damaged components immediately.
NOTE: All Meyer Sound products must be used in accor-
dance with local, state, federal, and industry regulations.
It is the owner’s and/or user’s responsibility to evaluate
the reliability of any rigging method for their application.
Rigging should be done only by experienced profession-
als.
Full-Range Systems
Introductory Concepts
The UPA-P is not a full range speaker. It is optimized to be
used with the Meyer USW-1P and UMS-1P self-powered
subwoofers. It can also be used with the Meyer 650-P and
PSW-2
self-powered subwoofers. For information on inte-
grating the UPA-P with speakers other than the USW-1P
contact Meyer Sound Technical Support.
Using the UPA-P in a full-range system is straightforward
but the following concepts are important to consider be-
fore installing a system.
Polarity
With the UPA-P in close-proximity to, and coplanar with,
the USW-1P, 650-P, or PSW-2, both speakers should be set
to the same polarity. Separating the UPA-P from the
subwoofer by more than 5 feet may require polarity rever-
sal or a delay line to compensate for the propagation
delay between the speakers and the measurement posi-
tion.
Array Design
Creating an effective array with the UPA-P requires a
precise understanding of how to combine the coverage
area and SPL of the individual speaker with those of
adjacent speakers. Array design is a trade-off between
increasing on-axis power and creating smooth transitions
between the coverage areas of adjacent speakers.
As the splay angle (the angle between adjacent cabinet
faces) decreases below the coverage angle of the indi-