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CHAPTER 2: POWER REQUIREMENTS
LINA 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 LINA.
AC POWER DISTRIBUTION
All components in an audio system (self-powered loudspeak-
ers, mixing consoles, and processors) must be properly con-
nected to an AC power distribution system, ensuring that AC
line polarity is preserved and that all grounding points are con-
nected 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
!
LINA 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 7 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 7: 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 8 illustrates a 120 V AC, 3-phase Wye distribution sys-
tem with each loudspeaker connected to two lines and a com-
mon earth/ground line. This configuration is possible because
LINA 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 Wye System (Two Lines to Loudspeakers)
TIP:
The 120 V AC, 3-phase Wye system with two
lines is recommended because it allows loud-
speakers to draw less current than with single-line sys-
tems, thereby reducing voltage drop due to cable
resistance. It also excludes the potential of varying
ground to neutral voltages producing an audible hum.
Loudspeaker
Loudspeaker
(120 V AC)
(120 V AC)
Loudspeaker
Loudspeaker
(208 V AC)
(208 V AC)
13
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