Chapter 2: Power Requirements; Ac Power Distribution - Meyer Sound LEO-M Operating Instructions Manual

CHAPTER 2: POWER REQUIREMENTS

LEO-M 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 LEO-M.

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
LEO-M remains within its 165–264 V AC oper-
ating 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 (Two Lines)
Line-Line-Earth/Ground
Figure 1 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 LEO-M 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 1: 120 V AC, 3-Phase Wye System (Two Lines to Loudspeakers)
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.
220 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Earth/Ground
Figure 2 illustrates a basic 220 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 220 V AC to each loudspeaker.
Loudspeaker
(220 V AC)
Line 1 (220 V AC)
Line 2 (220 V AC)
Line 3 (220 V AC)
Neutral
Earth/Ground
Figure 2: 220 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
CAUTION: For 220 V AC, 3-phase Wye sys-
tems, never connect two lines to the AC input
of LEO-M, as the resulting voltage would be higher
than the allowable upper voltage range (275 V AC)
and would damage the loudspeaker.
Loudspeaker Loudspeaker
(208 V AC) (208 V AC)
Loudspeaker Loudspeaker
(220 V AC) (220 V AC)
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