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CHAPTER 2
13
CHAPTER 2
M2D-SUB AMPLIFIER COOLING SYSTEM
The M2D-Sub loudspeaker uses a forced-air cooling
system with two fans to prevent the amplier module
from overheating. The fans draw air in through ducts
on the front of the cabinet, over the heatsink, and out
the rear of the cabinet (Figure 2.6). Because dust does
not accumulate in the amplier circuitry, its lifespan is
increased signicantly. The front grille helps to lter the air
and should always be in place during operation.
Figure 2.6. Airow through the M2D-Sub
CAUTION: When operating a weather-
protected M2D-Sub loudspeaker always
be sure the rain hood is fully open. Leaving the
hood closed or partially open will limit the airow
through the amplier, which could cause it to
overheat and shut down.
The variable-speed primary fan runs continuously and is
inaudible at its slowest speed. The primary fan's speed
increases when the heatsink reaches 42˚ C (108° F). The
fan reaches full speed at 62˚ C (144° F) and is still barely
audible near the cabinet, even without an audio signal.
In the event that the heatsink temperature reaches 74˚ C
(165° F), the secondary fan turns on and is clearly audible
without an audio signal. The secondary fan turns on in
response to:
Primary fan failure (check status immediately)
Very high signal levels over a prolonged period
Accumulation of dust along the cooling path
The secondary fan turns off when the temperature
decreases to 68˚ C (154° F).
NOTE: In the highly unlikely event that
the secondary fan does not keep the
temperature below 85˚ C (185° F), the M2D-
Sub automatically shuts down until AC power is
removed and reapplied. If the M2D-Sub shuts
down again after cooling and reapplying AC power,
contact Meyer Sound for repair information.
Despite the M2D-Sub loudspeaker's ltering, extensive
use or a dusty operating environment can allow dust
to accumulate along the path of the airow, preventing
normal cooling. To prevent this, you should periodically
remove the grille frame and amplier module and use
compressed air to clear dust from the grille, fans, and
heatsinks. Make sure that the air ducts are clear.
CAUTION: Be sure to unplug power to the
unit before cleaning the amplier.