7
Fans and Cooling System
The MSL-6 uses a forced-air cooling system with four
fans to prevent the amplifiers from overheating. The fans
draw air in through ducts on the front of the cabinet,
over the heatsinks, and out the rear of the cabinet. Since
dust does not accumulate in the amplifier circuitry, its
life-span is increased significantly.
The front grill surface acts as an air filter for the cooling
system and should always be in place during operation.
Despite the filtering, extensive use or a dusty operating
environment can allow dust to accumulate along the
path of the airflow, preventing normal cooling. We
recommend periodically removing the grill and amplifier
module and using a vacuum cleaner to clear dust from
the grill, fans, and heatsinks. Make sure that the air ducts
are clear and that there is at least six inches clearance
for exhaust behind the cabinet.
amplifier
heatsinks
fans
air
intake
Two variable-speed primary fans run continuously with
an inaudible operating noise of 22 dBA at 1 m at their
slowest speed. The primary fans begin increasing speed
when either of the two heatsinks reaches 42°C. The fans
reach full speed at 62°C and are barely audible near the
cabinet, even without an audio signal.
In the unusual event that the heatsink temperature
reaches 74°C, the secondary fans turn on and are clearly
audible. The secondary fans turn on in response to
• primary fan failure (check status immediately);
• high source levels for a prolonged period in hot
temperatures or direct sunlight;
• accumulation of dust along the cooling path;
• driver failure.
The secondary fans turn off when the temperature
decreases to 68°C.
TROUBLESHOOTING NOTE: In the highly unlikely event
that the secondary fans do not keep the temperature
below 85
°
C, the MSL-6 automatically shuts down until
AC power is removed and reapplied. If the MSL-6 shuts
down again after cooling and reapplying AC power,
contact Meyer Sound for repair information.
Rigging
A single MSL-6 weighs 510 lb (282 kg) and has twelve
pivoting lift rings (six on top, six on bottom), each with
a maximum working load capacity of 1500 lb (5:1
safety factor). The rigging hardware is depicted on page
12 in the
Dimensions
section.
Rigging load ratings assume a straight tensile pull and
that the cabinet is in new condition. 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.
The cabinet, exposed electronic circuitry, and drivers can
receive protective treatment that permits safe use in wet
conditions. Additionally, a rain hood can be fitted to
shield cables and electronics. Do not install a unit outdoors
without weather protection! Contact Meyer Sound for more
information.
NOTE: All Meyer Sound products must be used in
accordance with local, state, federal, and industry regu-
lations. 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
professionals.
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