Meyer Sound MTS-4A - Manual (Page 7)

7
RIGGING
compressed air to clear dust from the grill, filter, 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.
Two variable-speed primary fans run continuously with an
inaudible operating noise of 22 dBA at 1 m at their slowest
speed. When the temperature of the heatsinks reaches 42°C,
the primary fans begin increasing their speed, reaching full
speed at 62°C . At full speed, they 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; they turn off when the
temperature decreases to 68°C. The secondary fans are audible
at close proximity without an audio signal and turn on in
response to
• primary fan failure (check its status immediately);
• accumulation of dust in the cooling system path;
• a prolonged period of high source levels in hot
temperatures or direct sunlight;
• driver failure.
Troubleshooting Note: In the highly unlikely event that the
secondary fans do not keep the temperature below 85°C, the
MTS-4A automatically shuts down until AC power is removed
and reapplied. If the MTS-4A shuts down again after cooling
and reapplying AC power, contact Meyer Sound for repair
information.
The MTS-4A weighs 280 lb (127 kg). The maximum
recommended load for a single cabinet with aircraft pan
fittings is 600 lb (273 kg). This working load is based on a
5:1 safety factor. The MTS-4A has five rigging brackets (three
on top, two on bottom). 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.
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 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
professionals.
rigging brackets
(three on top, two on bottom)
Handles are for carrying only.
Do not use them for rigging!