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CHAPTER 2
NOTE:
Refer to Appendix B for details on the
MILO 120 loudspeaker's AC voltage require-
ments.
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 fans turn 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 il-
luminate or the system does not respond to
audio input after 10 seconds, remove AC power im-
mediately. 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 op-
erating range (brownout), MILO 120 uses stored energy to
continue functioning briefly, and shuts down only if voltage
does not rise above the low boundary before MILO 120's
storage circuits are depleted. How long MILO 120 will con-
tinue 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 dam-
age to the unit.
NOTE:
If voltage fluctuates within either
operating range, automatic tap selection
stabilizes the internal operating voltage. This tap
selection is instantaneous, and there are no audible
artifacts.
If MILO 120 shuts down due to either low or high voltage,
its power supply automatically turns on again after three
seconds if the voltage has returned to either normal oper-
ating window. If the MILO 120 loudspeaker does not turn
back on after ten seconds, remove AC power immediately
(see previous Caution).
8
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 AC voltage variations from the ser-
vice entry – or peak voltage drops due to cable runs
– do not cause the amplifier to cycle on and off.
CURRENT REQUIREMENTS
The MILO 120 loudspeaker presents a dynamic load to the
AC mains, which causes the amount of current to fluctuate
between quiet and loud operating levels. Since different
cables and circuit breakers heat up at varying rates, it is es-
sential to understand the types of current ratings and how
they correspond to circuit breaker and cable specifications.
The maximum long-term continuous current is the maxi-
mum 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 of 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 of fast reacting magnetic breakers.
Use Table 2.1 below as a guide when selecting cable gauge
size and circuit breaker ratings for your operating voltage.
Table 2.1: MILO 120 Current Ratings
Current Draw
115 V AC
Idle current
1.1 A rms
Max. long-term
11.2 A rms
continuous
Burst current
14.4 A rms
Ultimate short-
32 A pk
term peak
NOTE:
For best performance, the AC cable
voltage drop should not exceed 10 volts, or
10 percent at 115 volts and 5 percent at 230 volts.
Make sure that even with the AC voltage drop the
AC voltage always stays in the operating windows.
The minimum electrical service amperage required by a
MILO/MILO 120 system is the sum of each loudspeaker's
maximum long-term continuous current. An additional 30
230 V AC
100 V AC
0.55 A rms
1.3 A rms
5.6 A rms
12.9 A rms
7.2 A rms
16.6 A rms
16 A pk
37 A pk
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