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15
CHAPTER 3
Two variable-speed primary fans run continuously and
inaudibly at their slowest speed. The primary fans increase
speed when either of the two heatsinks reaches 42˚ C. The
fans reach full speed at 62˚ C and are still barely audible
even near the cabinet, and without an audio signal. In the
unusual event that the heatsink temperature reaches 74˚ C,
the secondary fans turn on and are clearly audible without
an audio signal. The secondary fans turn on in response to:
■ Primary fan failure (check status immediately)
■ High source levels for a prolonged period
■ Accumulation of dust along the cooling path
The secondary fans turn off when the temperature decreas-
es to 68˚ C.
NOTE: In the highly unlikely event that the
secondary fans do not keep the temperature
below 85˚ C, the MILO 120 loudspeaker automati-
cally shuts down until AC power is removed and
reapplied. If the MILO 120 loudspeaker shuts down
again after cooling and reapplying AC power, con-
tact Meyer Sound for repair information.
Despite filtering, extensive use or a dusty operating environ-
ment can allow dust to accumulate along the path of the
airflow, preventing normal cooling. To avoid this, you should
periodically remove the grille frame and amplifier module and
use compressed air to clear dust from the grille, fans and
heatsinks. Make sure that the air ducts are clear.
TIP: For weather-protected MILO 120
loudspeakers, the foam covering the horns
should also be cleaned with compressed air.
CAUTION: Be sure to unplug power to the
unit before cleaning the amplifier.