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If either LED remains on for longer than three seconds, that
channel incurs these consequences:
• Increasing the input level will not increase the volume.
• The system distorts due to clipping and nonlinear
driver operation.
While the USW-1P limiters fully protect the system under
overload conditions and exhibit smooth sonic characteris-
tics; we recommend that you do not intentionally drive the
USW-1P into continuous limiting to attain compression ef-
fects.
For applications where large amounts of compression are
required, we recommend using an outboard compressor/lim-
iter for greater control of limit and compressor effects.
Amplifier Natural Convection Cooling System
The USW-1P’s amplifier employs a natural convection cool-
ing system that is cooled by the air flowing over the
heatsink. Allow for proper ventilation of fresh air when
using the speaker in tightly packed conditions.
If the temperature of the heatsink reaches 85°C (185°F), the
On/Temp. LED on the rear panel turns from green (On) to red
(Temp.) and the limiter threshold is lowered to 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 applications,
USW-1Ps when driven into continuous limiting under severe
temperature conditions, or where ventilation is restricted,
may benefit from the optional fan kit which increases air flow
to maintain a safe operating temperature.
The easy-to-install fan, powered by the 24V Fan rear panel
connector, blows air directly onto the heatsink. The fan speed
increases as the heatsink temperature rises, which maintains a
safe operating temperature 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 out the back of the cabinet,
there must be at least six inches clearance behind the cabinet,
and adequate air flow.
Rigging
The USW-1P weighs 137 lb (62 kg). The maximum recom-
mended load for an USW-1P with aircraft pan fittings is 420
lb (191 kg). This working load is based on a 5:1 safety factor.
The USW-1P has three rigging plates on top; each plate is
capable of supporting the full working load of the cabinet.
There are four types of interchangeable rigging plates, 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 signifi-
cantly. Load ratings can also be reduced by age, wear, and
damage. It is important to inspect the rigging hardware regu-
larly and replace worn or damaged components immediately.
NOTE: All Meyer Sound products must be used in
accordance with local, state, federal, and industry
regulations. It is the owners and/or users responsibility
to evaluate the reliability of any rigging method for
their application. Rigging should be done only by
experienced professionals.