Meyer Sound Amie-Sub, Operating Instructions Manual

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CHAPTER 2: POWER REQUIREMENTS
The Amie-Sub subwoofer combines advanced loudspeaker
technology with equally advanced power capabilities.
Understanding power distribution, voltage and current
requirements, and electrical safety guidelines is critical for
the safe operation of the device.
AC POWER DISTRIBUTION
All components in an audio system (self-powered
loudspeakers, mixing consoles, and processors) must be
properly connected to an AC power distribution system,
ensuring that AC line polarity is preserved and that all
grounding points are connected to a single node or
common point using the same cable gauge (or larger) as the
neutral and line cables.
CAUTION: Make sure the voltage received by
the Amie-Sub loudspeaker remains within its
90–264 V AC operating range. In addition, the
ground line must always be used for safety reasons
and the line-to-ground voltage should never exceed
250 V AC (typically 120 V AC from line to ground).
CAUTION: Before applying AC power to any
Meyer Sound self-powered loudspeaker, make
sure that the voltage potential difference between the
neutral and earth-ground lines is less than 5 V AC
when using single-phase AC wiring.
NOTE: Improper grounding of connections
between loudspeakers and the rest of the
audio system may produce noise or hum, or cause
serious damage to the input and output stages of the
system’s electronic components.
120 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Earth/Ground
Figure 4 illustrates a basic 120 V AC, 3-phase Wye
distribution system with the loudspeaker load distributed
across all three phases, with each loudspeaker connected
to a single line and common neutral and earth/ground lines.
This system delivers 120 V AC to each loudspeaker.
120 V AC, 3-Phase Wye System (Two Lines)
Line-Line-Earth/Ground
Figure 5 illustrates a 120 V AC, 3-phase Wye distribution
system with each loudspeaker connected to two lines and a
common earth/ground line. This configuration is possible
because Amie-Sub tolerates elevated voltages from the
ground line and does not require a neutral line. This system
delivers 208 V AC to each loudspeaker.
TIP: The 120 V AC, 3-phase Wye system with
two lines is recommended because it allows
loudspeakers to draw less current than with
single-line systems, thereby reducing voltage drop
due to cable resistance. It also excludes the potential
of varying ground to neutral voltages producing an
audible hum.
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Figure 4: 120 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
Figure 5: 120 V AC, 3-Phase Wye System (Two Lines to Loudspeakers)
Neutral
Earth/Ground
Line 1 (120 V AC)
Line 3 (120 V AC)
Line 2 (120 V AC)
Loudspeaker
(120 V AC)
Loudspeaker
(120 V AC)
Loudspeaker
(120 V AC)
Neutral
Earth/Ground
Loudspeaker
(208 V AC)
Loudspeaker
(208 V AC)
Loudspeaker
(208 V AC)
Line 1 (120 V AC)
Line 3 (120 V AC)
Line 2 (120 V AC)