Meyer Sound UPQ-D Series, Руководство по эксплуатации

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UPQ-D SERIES OPERATING INSTRUCTIONS
21
HF and LF Limit LEDs
The low- and high-frequency drivers for UPQ-D Series
loudspeakers are powered by separate amplifier channels, each
with their own limiter. Limiting activity is indicated with two Limit
LEDs on the user panel. The top Limit LED (Figure 12) indicates
limiting for the high-frequency channel and the bottom 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.
A UPQ-D Series loudspeaker 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 UPQ-D Series
loudspeaker system begins to limit before reaching the
desired SPL, consider adding more units to the system.
CAUTION:
ON/STATUS LED
During normal operation, when a UPQ-D Series loudspeaker is
powered on, the On/Status LED is solid green. If the
loudspeaker encounters 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 protect the loudspeaker.
If a loudspeaker is overheating (for RMS-equipped
loudspeakers, one can verify this situation in Compass RMS), a
reduction in SPL may be necessary. If after a reduction in SPL
and an appropriate 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 UPQ-D Series loudspeaker
system consistently overheats before reaching
the desired SPL, consider adding more units to the
system.
NOTE: During startup, the On/Status LED flashes
multiple colors successively. For more
information about the power on sequence, see
“Intelligent AC Power Supply” on page 16.
TIP: When a UPQ-D Series loudspeaker 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 6, “RMS
Remote Monitoring System.”
AMPLIFIER COOLING SYSTEM
The UPQ-D Series loudspeaker is convection cooled. The
amplifier’s heat sink provides natural convection cooling from
the air flowing near its fins.
CAUTION: To keep a UPQ-D Series loudspeaker
from overheating, allow at least 3 inches behind
the loudspeaker for proper ventilation.
TIP: The UPQ-D Series loudspeaker heat sink can
reach temperatures up to 80° C (176° F) during
extreme operation. Wait 15 minutes for the unit to cool
before touching.
Figure 12: UPQ-D1/2/3 Limit LEDs
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