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CHAPTER 2: POWER REQUIREMENTS
The self-powered MILO 120 is advanced loudspeaker tech-
nology with equally advanced power capabilities. Under-
standing MILO 120's power distribution, voltage and current
requirements, as well as electrical safety issues, is critical to
the safe and correct operation and deployment of the MILO
120 loudspeaker.
AC POWER
When AC power is applied to the MILO 120 loudspeaker,
the Intelligent AC power supply automatically selects the
correct operating voltage, allowing MILO 120 to be used
internationally without manually setting voltage switches.
The Intelligent AC power supply performs the following
protective functions to compensate for hostile conditions on
the AC mains:
■ Suppresses high-voltage transients up to several kilo-
volts
■ Filters common mode and differential mode radio fre-
quencies (EMI)
■ Sustains operation temporarily during low-voltage peri-
ods
■ Provides soft-start power-up, eliminating high inrush
current
VOLTAGE REQUIREMENTS
The MILO 120 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
MILO 120 can withstand continuous voltages up to 275
volts and allows any combination of voltage to GND (that is
neutral-line-ground or line-line-ground).
CAUTION:
Continuous voltages higher than
275 volts can damage the unit.
TIP:
Since MILO 120 does not require a dedi-
cated neutral, it can tolerate elevated volt-
ages from ground and can be connected between
line-line terminals in a 120 V 3-phase Wye system.
This results in 208 V AC between lines (nominal) and
will therefore draw less current for the same output
power compared to operating MILO 120 from 120 V
AC (line-neutral). Make sure that the voltage remains
within the recommend operating window (180 V
AC to 250 V AC). The ground terminal must always
be used for safety and the line to ground voltage
should never exceed 250 V AC (typically there will
be 120 V AC from line to ground in the above ex-
ample).
MILO 120 uses a NEMA L6-20P, an IEC 309 male power
connector or a multi-pin VEAM connector and complies
with worldwide product safety standards.
AC POWER DISTRIBUTION
All amplifier modules and directly associated audio equip-
ment (mixing consoles, processors, etc.) must be properly
connected to the AC power distribution, preserving AC line
polarity and connecting earth ground such that all ground-
ing points are connected to a single node or common
point using the same cable gauge as the neutral and line(s)
cable(s).
Improper grounding connections between loudspeakers
and the rest of the audio system may produce noise, hum
and/or serious damage to the input/output stages in the
system's electronic equipment.
CAUTION:
Before applying AC to any Meyer
Sound self-powered loudspeaker, be sure
that the voltage potential difference between neutral
and earth ground is less than 5 V AC.
Figure 2.1 shows a sample three-phase AC distribution sys-
tem, with the load between loudspeakers distributed among
the three phases and all of the loudspeakers connected to
common neutral and earth ground points.
Figure 2.1.
A sample AC power distribution block diagram
CHAPTER 2
7
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