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CHAPTER 2: POWER REQUIREMENTS
The 750-LFC combines advanced loudspeaker technology
with equally advanced power capabilities. Understanding
power distribution, voltage and current requirements, and
electrical safety guidelines is critical to the safe operation of
the 750-LFC.
AC POWER DISTRIBUTION
All components in an audio system (self-powered loud-
speakers, mixing consoles, and processors) must be prop-
erly 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 750-LFC 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 (typi-
cally 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 7 illustrates a basic 120 V AC, 3-phase Wye distribu-
tion 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 sys-
tem delivers 120 V AC to each loudspeaker.
Loudspeaker
(120 V AC)
Line 1 (120 V AC)
Line 2 (120 V AC)
Line 3 (120 V AC)
Neutral
Earth/Ground
Figure 7: 120 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
120 V AC, 3-Phase Delta System (Two Lines)
Line-Line-Earth/Ground
Figure 8 illustrates a 120 V AC, 3-phase Delta distribution
system with each loudspeaker connected to two lines and a
common earth/ground line. This configuration is possible
because the 750-LFC tolerates elevated voltages from the
ground line and does not require a neutral line. This system
delivers 208 V AC to each loudspeaker.
Loudspeaker
(208 V AC)
Line 1 (120 V AC)
Line 2 (120 V AC)
Line 3 (120 V AC)
Neutral
Earth/Ground
Figure 8: 120 V AC, 3-Phase Delta System (Two Lines to Loudspeakers)
TIP:
The 120 V AC, 3-phase Delta 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.
Loudspeaker
Loudspeaker
(120 V AC)
(120 V AC)
Loudspeaker
Loudspeaker
(208 V AC)
(208 V AC)
9
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