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6
CHAPTER 1
7
CHAPTER 1
M2D-Sub Voltage Requirements
The M2D-Sub loudspeaker operates safely and without
audio discontinuity if the AC voltage stays within either of
two operating windows at 50 or 60 Hz:
85 to 134 volts
165 to 264 volts
CAUTION: Continuous voltages higher than
264 volts can damage the unit.
After applying AC power, the proper operating voltage is
automatically selected, but the system is muted. During the
next three seconds the following events occur:
1. The primary fan turns on.
2. The main power supply slowly ramps on.
3. The green Active LED on the User Panel lights up,
indicating that the system is enabled and ready to pass
audio signals.
CAUTION: If the Active LED does not
illuminate or the system does not respond
to audio input after ten seconds, remove AC power
immediately. Verify that the voltage is within the
proper range. If the problem persists, please contact
Meyer Sound or an authorized service center.
If voltage drops below the low boundary of either safe
operating range (brownout), the M2D-Sub loudspeaker uses
stored energy to continue functioning briey, and shuts
down only if voltage does not rise above the low boundary
before the M2D-Sub loudspeaker’s storage circuits are
depleted. How long the loudspeaker will continue to
function during brownout depends on the amount of voltage
drop and the audio source level during the drop.
If the voltage increases above the upper boundary of
either range, the power supply rapidly turns off, preventing
damage to the unit.
NOTE: If voltage uctuates within either
operating range, automatic tap selection
stabilizes the internal operating voltage. This tap
selection is instantaneous, and there are no audible
artifacts.
If the M2D-Sub loudspeaker shuts down due to either low
or high voltage, its power supply automatically turns on
after three seconds if the voltage has returned to either
normal operating window. If the M2D-Sub does not turn
back on after ten seconds, remove AC power immediately
(see previous Caution).
NOTE: It is recommended that the supply
be operated in the rated voltage windows at
least a few volts away from the turn on/off points.
This ensures that that AC voltage variations from the
service entry – or peak voltage drops due to cable
runs – do not cause the amplier to cycle on and off.
M2D-Sub Current Requirements
The M2D-Sub loudspeaker presents a dynamic load to the
AC mains, which causes the amount of current to uctuate
between quiet and loud operating levels. Since different
cables and circuit breakers heat up at varying rates, it is
essential to understand the types of current ratings and how
they correspond to circuit breaker and cable specications.
The maximum long-term continuous current is the maximum
rms current during a period of at least ten seconds. It is
used to calculate the temperature increase in cables, in
order to select a cable size and gauge that conforms to
electrical code standards. It is also used to select the rating
for slow-reacting thermal breakers.
The burst current is the maximum rms current during a
period of approximately one second, used to select the
rating for most magnetic breakers and to calculate the peak
voltage drop in long AC cables according to the formula:
V pk (drop)= I pk x R (cable total).
The ultimate short-term peak current is used to select the
rating for fast-reacting magnetic breakers.
Use Table 1.2 below as a guide when selecting cable gauge
size and circuit breaker ratings for your operating voltage.
Table 1.2. M2D-Sub Current Ratings
Current Draw 115 V AC 230 V AC 100 V AC
Max. long-term
continuous
8.8 A rms 4.4 A rms 10 A rms
Burst current 19 A rms 9.5 A rms 22 A rms
Ultimate short-
term peak
39 A pk 20 A pk 45 A pk
Idle current 1.2 A rms 0.6 A rms 1.3 A rms