3
Introduction
The Integrated Design
The Meyer USW-1P self-powered subwoofer is composed of:
• two 15-inch cone drivers.
• phase-corrected, optimized control electronics;
• a two-channel amplifier (550 watts total).
The drivers, control electronics, and amplifier are integrated
into a compact enclosure. The USW-1P paired with the UPA-P
Series is ideally suited for compact, high-powered PA applica-
tions, such as main PA, churches, 5.1 systems, and theatres.
The USW-1P is more than a powered version of the Meyer
USW-1, The powered USW-1P implements these significant
design improvements:
• The gain structure between the control electronics and
amplifier is perfectly matched.
• The amplifier is optimized for the system, providing sub-
stantial power without endangering the drivers.
• The integrated design simplifies setup and installa-
tion, eliminates amp racks, and extends the durability
and reliability of the loudspeaker.
AC Power
The USW-1P uses a PowerCon locking 3-pole AC mains
connector that prevents inadvertent disconnection. The unit
must have the correct power plug for the AC power in the area
in which it will be used.
Engagement
2
1
2
1
3
Separation
When AC power is applied to the USW-1P, an Intelligent AC
supply automatically selects the correct operating voltage, al-
lowing the USW-1P to be used internationally without manu-
ally setting voltage switches. The Intelligent AC supply per-
forms the following protective functions to compensate for
hostile conditions on the AC mains:
• suppresses high voltage transients up to several kilo-
volts
• filters EMI (radio frequencies and noise present on the
AC line)
• sustains operation during low-voltage periods, which
minimizes audio discontinuity
• provides soft-start power-up, which eliminates high
inrush current
The USW-1P can withstand continuous voltages up to 264V
and allows any combination of voltage to GND (i.e. Neutral-
Hot-GND, Hot-Hot-GND). Continuous voltages higher than
264V may damage the unit.
Voltage Requirements
The USW-1P operates safely and without audio discontinuity
if the AC voltage stays within the range 88–264V, 47–63 Hz.
After applying AC power, the system is muted while the cir-
cuitry charges up and stabilizes. After two seconds, the On/
Temp. LED on the user panel illuminates green, the system
unmutes and is ready to pass audio signals. If the On/Temp.
LED does not illuminate or the system does not respond to
audio input after ten seconds, consult the Troubleshooting
section.
The USW-1P’s power supply uses stored energy to continue
functioning for about 10 AC cycles if the voltage decreases
below 88V (a condition known as brownout). The precise
length of time the unit functions during brownout depends
on the operating level and how low the voltage drops. The unit
turns off if the voltage does not increase above 88V for 1 to
5 seconds. If the USW-1P shuts down due to brownout, the
power supply automatically turns on if the voltage returns to
the normal operating range. If the USW-1P does not turn back
on after ten seconds, consult the Troubleshooting section.
NOTE: We recommend that the supply be operated at
least a few volts away from the upper and lower
bounds of the operating range to avoid possible
shutdown.
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