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HF and LF Limit LEDs
The low- and high-frequency drivers for LINA are powered by
separate amplifier channels, which have limiters. Limiting
activity is indicated with two Limit LEDs on the user panel. The
Limit LEDs (Figure 16) indicates limiting for the high-frequency
channel and/or the low-frequency channels.
Figure 16: LINA Limit LEDs
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.
LINA performs within its acoustical specifications at normal
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 LINA loudspeaker
system begins to limit before reaching the desired SPL,
consider adding more units to the system.
AMPLIFIER COOLING SYSTEM
LINA is convection cooled. The amplifier's heat sink provides
natural convection cooling from the air flowing near its fins.
CAUTION:
To keep LINA from overheating, allow
!
at least 6 in behind the loudspeaker for proper
ventilation.
CAUTION:
LINA's heat sink can reach tempera-
!
tures up to 80° C (176° F) during extreme opera-
tion. Wait 15 minutes for the unit to cool before
touching.
ACTIVE/STATUS LED
During normal operation, when LINA is powered on, the
Active/Status LED is solid green. If the loudspeaker encoun-
ters a hardware fault, or the unit begins to overheat, the LED
flashes red. In some instances, the loudspeaker will continue
to output audio while the LED flashes red, though with a
reduction in the limiter threshold and acoustic output to pro-
tect the loudspeaker.
If a loudspeaker is overheating (for RMS-equipped loudspeak-
ers, you can verify this in Compass RMS), a reduction in SPL
may be necessary. If, after a reduction in SPL and an appropri-
ate cooling period, the Active/Status LED continues to flash
red (does not return to solid green), contact Meyer Sound
Technical Support.
If the Active/Status LED flashes red and the loudspeaker does
not output audio, contact Meyer Sound Technical Support
immediately.
CAUTION:
If a LINA loudspeaker system consis-
!
tently overheats before reaching the desired SPL,
consider adding more units to the system.
NOTE:
During startup, the Active/Status LED
flashes multiple colors successively. For more
information about the power on sequence, see
"Intelligent AC Power Supply" on page 16.
TIP:
When LINA is connected to an RMS network,
the Compass RMS software provides additional
feedback about the loudspeaker's hardware status and
operating temperature. For more information, see
Chapter 5, "RMS Remote Monitoring System."
LINA OPERATING INSTRUCTIONS
21
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