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CHAPTER 2: POWER REQUIREMENTS
CAL VOLTAGE REQUIREMENTS
CAL operates safely and continuously when the AC voltage
stays within 100–265 V AC at 50 or 60 Hz. The loudspeaker
can withstand continuous voltages up to 265 V and allows
any combination of voltage to GND (neutral-line-ground or
line-line-ground).
If the voltage drops below 90 V (brownout), CAL uses stored
power to continue operating temporarily; the loudspeaker
shuts down if the voltage does not rise above the low
boundary before the stored power is used.
If the voltage rises above 265 V, the power supply immedi-
ately shuts off to prevent damage to the unit.
If CAL shuts down due to either low or high voltage, its
power supply automatically powers up again after three sec-
onds, so long as the voltage has returned to its normal oper-
ating window. If CAL does not power up after 10 seconds,
remove AC power immediately and contact Meyer Sound
Technical Support.
CAUTION:
The power source for CAL should
always operate within the required voltage
range, at least a few volts from the upper and lower
ranges. This will ensure that AC voltage variations
from the service entry — or peak voltage drops due
to cable runs — will not cause the loudspeaker's
amplifiers to cycle on and off or cause damage to the
power supply.
NOTE:
When voltage fluctuates within CAL's
operating range, automatic tap selection stabi-
lizes the operating voltage. This tap selection is
instantaneous with no audible artifacts.
NOTE:
Since CAL does not require a dedicated
neutral line, and it can tolerate elevated volt-
ages from the ground line, it can be connected to
line-line terminals in 120 V, 3-phase Wye systems.
This results in 208 V AC between lines (nominal) and
therefore draws less current than when using 120 V
AC (line-neutral). Make sure that the voltage remains
within CAL's recommended operating window
(100-264 V AC). The ground line must always be used
for safety reasons and the line-to-ground voltage
should never exceed 264 V AC (typically 120 V AC
from line-to-ground).
12
Powering Up CAL Loudspeakers
When AC power is applied to CAL, its Intelligent AC™ power
supply automatically selects the correct operating voltage,
allowing it to be used internationally without manually setting
voltage switches. In addition, Intelligent AC provides soft-
start power up, eliminating high inrush currents; suppresses
high-voltage transients up to several kilovolts; filters com-
mon mode and differential mode radio frequencies (EMI);
and sustains operation temporarily during low-voltage peri-
ods.
When powering up CAL, the following startup events occur
over several seconds.
1. Audio output is muted.
2. Voltage is detected and the power supply mode is auto-
matically adjusted as necessary. The power supply
ramps up.
3. After the power up sequence and system check have
completed, the ON/Status LED turns solid green, indicat-
ing the loudspeaker is ready to reproduce audio.
CAUTION:
If the ON/Status LED does not turn
solid green after powering up and audio is
muted, the loudspeaker has encountered a failure
and may need to be serviced. Contact Meyer Sound
Technical Support.
CAL CURRENT REQUIREMENTS
The current draw for CAL is dynamic and fluctuates as oper-
ating levels change. Since different cables and circuit break-
ers heat up at varying rates, it is important to understand the
following types of current ratings and how they affect circuit
breaker and cable specifications.
■
Idle Current — The maximum rms current during idle
periods.
Maximum Long-Term Continuous Current — The
■
maximum rms current during a period of at least 10 sec-
onds. The Maximum Long-Term Continuous Current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rat-
ing for slow-reacting thermal breakers.
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