Meyer Sound 600-HP - Manual (Page 11)

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CHAPTER 2
Self-powered and highly portable, the 600-HP subwoofer
incorporates advanced loudspeaker technology with
equally advanced power capabilities. Understanding the
600-HP subwoofer’s power distribution, voltage and cur-
rent requirements, as well as electrical safety issues, is
critical to the safe and correct operation and deployment
of the 600-HP subwoofer.
AC POWER
When AC power is applied to the 600-HP subwoofer, the
Intelligent AC™ power supply automatically selects the
cor-rect operating voltage, allowing the 600-HP subwoofer
to be used internationally without manually setting voltage
switches. The Intelligent AC power supply performs the
following protective functions to compensate for hostile
conditions on the AC mains:
■ Suppresses high-voltage transients up to several
kilovolts
■ Filters common mode and differential mode radio
frequencies (EMI)
■ Sustains operation temporarily during low-voltage
periods
■ Provides soft-start power-up, eliminating high inrush
current
VOLTAGE REQUIREMENTS
The 600-HP subwoofer operates safely and without audio
discontinuity if the AC voltage stays within either of two
operating ranges at 50 or 60 Hz:
■ 85 to 134 volts
■ 165 to 264 volts
The 600-HP subwoofer can withstand continuous voltages
up to 275 volts and allows any combination of voltage to
GND (that is neutral-line-ground or line-line-ground).
CAUTION: Continuous voltages higher than
275 volts can damage the unit.
TIP: Since the 600-HP subwoofer does
not require a dedicated Neutral, and it can
tolerate elevated voltages from ground, it can be
connected between Line-Line terminals in a
120 V 3-phase Wye system. This results in 208 V
AC between lines (nominal) and will therefore draw
less current for the same output power compared
to operating the subwoofer from 120 V AC
(Line-Neutral). Make sure that the voltage remains
within the 600-HP subwoofer’s recommended
operating window (180 V AC to 250 V AC). The
Ground terminal must always be used for safety
and the Line to Ground voltage should never
exceed 250 V AC (typically there will be 120 V AC
from Line to Ground in the above example).
The 600-HP subwoofer uses a NEMA L6-20P, an IEC 309
male power connector, a PowerCon connector, or a multi-
pin VEAM connector and complies with worldwide product
safety standards.
AC POWER DISTRIBUTION
All amplifier modules and directly associated audio equip-
ment (mixing consoles, processors, etc.) must be properly
connected to the AC power distribution, preserving AC
line polarity and connecting earth ground such that all
grounding points are connected to a single node or com-
mon point using the same cable gauge as the neutral and
line(s) cable(s).
Improper grounding connections between loudspeakers
and the rest of the audio system may produce noise, hum
and/or serious damage to the input/output stages in the
system’s electronic equipment.
CAUTION: Before applying AC to any
Meyer Sound self-powered loudspeaker, be
sure that the voltage potential difference between
neutral and earth ground is less than 5 V AC.
Figure 2.1 shows a sample three-phase AC distribution
system, with the load between loudspeakers distributed
among the three phases and all of the loudspeakers
connected to common neutral and earth ground points.
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Figure 2.1. A sample AC power distribution block diagram
CHAPTER 2: POWER REQUIREMENTS