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CHAPTER 2: POWER REQUIREMENTS
LEOPARD 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 LEOPARD.
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
LEOPARD 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 6 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.
Loudspeaker
(120 V AC)
Line 1 (120 V AC)
Line 2 (120 V AC)
Line 3 (120 V AC)
Neutral
Earth/Ground
Figure 6: 120 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
120 V AC, 3-Phase Wye System (Two Lines)
Line-Line-Earth/Ground
Figure 7 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 LEOPARD 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 7: 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. It also excludes the potential of
varying ground to neutral voltages producing an audi-
ble hum.
230 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Earth/Ground
Figure 8 illustrates a basic 230 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 230 V AC to each loudspeaker.
Loudspeaker
Loudspeaker
(120 V AC)
(120 V AC)
Loudspeaker
Loudspeaker
(208 V AC)
(208 V AC)
13
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