LEO-M OPERATING INSTRUCTIONS
13
HF and LF Limit LEDs
The low- and high-frequency drivers for LEO-M are powered
by separate amplifier channels, each with their own limiter.
Limiting activity is indicated with two Limit LEDs on the user
panel. The HF Limit LED indicates limiting for the high-fre-
quency channel and the LF Limit LED indicates limiting for
the low-frequency channel.
When engaged, the limiters not only protect the drivers but
also prevent signal peaks from causing excessive distortion
in the amplifier channels, thereby preserving headroom and
maintaining smooth frequency response at high levels.
When levels return to normal, below the limiter thresholds,
limiting ceases.
LEO-M performs within its acoustical specifications at nor-
mal temperatures when the Limit LEDs are unlit, or when the
LEDs are lit for 2 seconds or less and then turn off for at
least 1 second. If the LEDs remain lit for longer than
3 seconds, the loudspeaker enters hard limiting where:
■ Increases to the input level have no effect
■ Distortion increases due to clipping
■ Drivers are subjected to excessive heat and excursion,
thereby compromising their lifespan
CAUTION: The Limit LEDs indicate when a
safe, optimum level is exceeded. If a LEO-M
loudspeaker system begins to limit before reaching
the desired SPL, consider adding more units to the
system.
NOTE: LEO-M uses optical limiters that add no
noise and have no effect on the signal when
limiting is not engaged.
AMPLIFIER COOLING SYSTEM
LEO-M employs forced-air cooling with four ultrahigh-speed
fans (two primary, and two reserve) to prevent the amplifier
from overheating. The fans draw air in through ducts on the
rear of the cabinet, over the heat sinks, and out the rear of
the cabinet. Because dust does not accumulate in the
amplifier and power circuitry, their lifespans are increased
significantly.
CAUTION: To keep LEO-M from overheating,
allow at least 6 inches behind the loudspeaker
for proper ventilation.
CAUTION: If a LEO-M loudspeaker system
consistently overheats before reaching the
desired SPL, consider adding more units to the sys-
tem.
TIP: When LEO-M is connected to an RMS net-
work, the Compass RMS software provides addi-
tional feedback on the loudspeaker’s hardware status
and operating temperature. For more information, see
Chapter 5, “RMS Remote Monitoring System.”
LEO-M Limit LEDs
LEO-M Fans
Primary Fans Reserve Fans
Type Ultrahigh-speed Ultrahigh-speed
Number 2 2
Location 1 for each heat sink (2) 1 for each heat sink (2)
Fan speeds
and heat
sink temp.
<34° C Half speed <52° C Off
34° – 50° C Ramps up >52° C Full speed
50° – 84° C Full speed <44° C Off
>95° C Audio
muted, fans
continue at
full speed
>95° C Audio
muted, fans
continue at
full speed
<86° C Audio
unmuted,
fans con-
tinue at full
speed
<86° C Audio
unmuted,
fans con-
tinue at full
speed
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