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Introduction
The Meyer PSW-4 self-powered subwoofer contains
independent amplifier and control electronics for one
low (15”) and one sub (18”) frequency driver in a
trapezoidal enclosure. The acoustical crossover point is
60 Hz, which allows each driver to function in its
most efficient frequency range. The PSW-4 is phase-
corrected through the crossover to produce exceptional
system impulse response.
The PSW-4 has the following acoustical specifications:
Frequency Response ±4 dB 32 – 160 Hz
Phase Response ±90° 45 – 110 Hz
Dynamic Range > 110 dB
The PSW-4 is compatible with the Meyer CQ™ Series,
MSL-4, and MTS-4 self-powered speakers, and can be
used in any system requiring additional low frequency
power. The PSW-4’s integrated design improves perfor-
mance, durability, and reliability, eliminates amplifier
racks, and simplifies setup and installation.
The PSW-4’s trapezoidal shape facilitates the creation of
speaker arrays that maximize the coverage area for the
size of the array. Rigging hardware is provided to safely
suspend the PSW-4 in elevated installations.
The PSW-4 can be equipped to operate with the Remote
Monitoring System (RMS) network and software
application. RMS displays signal and power levels,
driver and cooling fan status, limiter activity, and
amplifier temperature for all speakers in the network
on a Windows-based PC. Contact Meyer Sound for
more information about RMS.
AC Power
When AC power is applied to the PSW-4, the Intelligent
AC™ supply automatically selects the correct operating
voltage, allowing the PSW-4 to be used internationally
without manually setting voltage switches. The Intelligent
AC 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 deference mode radio
frequencies (EMI)
• sustains operation during low voltage periods
• provides soft-start power-up, which eliminates
high inrush current
The PSW-4 can withstand continuous voltages up to
275 V and allows any combination of voltage to GND
(i.e. Neutral-Hot-GND, Hot-Hot-GND). Continuous
voltages higher than 275 V may damage the unit.
The PSW-4 uses a NEMA L6-20P or IEC 309 male power
inlet and satisfies UL, CSA, and EC safety standards.
Voltage Requirements
The PSW-4 operates safely and without audio disconti-
nuity if the AC voltage stays within either of two operating
windows: 85–134 V or 165–264 V, at 50 or 60 Hz. After
applying AC power, the proper operating voltage is
automatically selected, but the system is muted. During
the next three seconds, the primary fan turns on, the
main power supply slowly ramps on, the green Active
LED on the user panel illuminates, and the system is
enabled to pass audio signals.
TROUBLESHOOTING NOTE: If the Active LED does
not illuminate or the system does not respond to audio
input after ten seconds, remove AC power. Electronics
technicians with access to a test bench can contact
Meyer Sound to receive
The Meyer Sound Self-Powered
Series MP-2 and MP-4 Field Verification Procedure
(part # 17.022.066.01). This service document contains
a series of tests to verify that the power supply and
amplifier are functioning properly. Other users should
contact Meyer Sound or an authorized service center.
If the voltage decreases below the lower bound of either
operating range (brown-out), the supply uses stored
energy to continue functioning briefly. The unit turns
off if the voltage does not increase above the threshold
before the storage circuits are depleted. The time that
the PSW-4 continues to operate during brown-out
depends on how low the voltage drops and the audio
source level during this period.
If the voltage fluctuates within either operating range,
automatic tap selection stabilizes the internal operating
voltage. This tap selection is instantaneous and there
are no audible artifacts. If the voltage increases above
the upper bound of either range, the power supply
turns off rapidly, preventing damage to the unit.
If the PSW-4 shuts down due to either low or high
voltage, the power supply automatically turns on after
three seconds if the voltage has returned to either normal
operating range. If the PSW-4 does not turn back on
after ten seconds, remove AC power and refer to the
TROUBLESHOOTING NOTE
above.
NOTE: We recommend that the supply be operated at
least a few volts away from the upper and lower bounds
of the operating windows to avoid brown-out and
possible shut-down.