Meyer Sound CAL 32, Operating Instructions Manual

Page: 17 / 44

CAL OPERATING INSTRUCTIONS
17
ON/STATUS LED
During normal operation, CAL’s On/Status LED is green. If
the loudspeaker’s internal temperature reaches 75° C
(167° F), the LED turns solid yellow and the loudspeaker’s
gain is reduced by 3 dB. Though CAL will continue to
operate normally with the lower gain, when the On/Status
LED is yellow, this is an indication that the loudspeaker is
reaching its maximum heat dissipation and a reduction of
input level is recommended. When the loudspeaker’s
internal temperature cools to 60° C (140° F), the amplifier
returns to normal operation.
TIP: When CAL is connected to a computer
running Compass Control Software, the RMS
tab provides additional feedback and warnings, if
encountered, about the loudspeaker’s operating tem
-
perature.
LIMIT LEDS
When the audio input level of a CAL would cause the
amplifiers to exceed the maximum output levels for its
drivers, CAL, limiting is engaged and is indicated by the two
Limit LEDs on the CAL user panel. The left LED indicates
limiting for low-frequency channels while the right LED
indicates limiting for high-frequency channels. When
engaged, limiting not only protects the drivers, but also
prevents signal peaks from causing excessive distortion in
the amplifier channels, thereby preserving headroom and
maintaining smooth frequency responses at high levels.
When source levels return to normal, below the limiter’s
threshold, limiting ceases.
CAL performs within its acoustical specifications when the
Limit LEDs are unlit, or if the LEDs are lit for 2 seconds or
less and then turn off for at least 1 second. If an LED
remains 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 and nonlinear driver
operation.
•
Drivers are subjected to excessive heat and excursion,
which will compromise their life span and may
eventually cause damage over time.
CAUTION: The Limit LEDs indicate when a
safe, optimum level is exceeded. If a CAL loud -
speaker begins to limit before reaching the required
SPL, consider replacing it with a CAL model with
more amplifier channels/drivers, or consider adding
more CAL loudspeakers to the system to achieve the
desired SPL without exposing the loudspeakers to
excessive levels and possible overheating.
On/Status LED
Limit LEDs
On/
Status
Limit
!