Meyer Sound UMS-1P - Manuel (Page 4)

Thank you for purchasing the Meyer
Sound UMS-1P: a compact, self-powered
subwoofer system that provides power-
ful low frequency extension in applica-
tions where both audio quality and cab-
inet size are critical considerations.
Although designed principally as a low-
end companion for Meyer Sound's UPM-
1P reinforcement loudspeaker, the UMS-
1P is equally adaptable-for use in con-
junction with other Meyer Sound loud-
speaker models such as HD-1, HM-1/1S,
and UPA-1P/2P.
The UMS-1P's bass reflex cabinet houses
dual MS-410,10-inch cone drivers, active
signal processing (including Meyer
Sound's proprietary phase correction cir-
cuits) and a two-channel power amplifi-
er with total maximum burst power of
400W. Performance is exemplary in every
respect, with higher acoustic power out-
put and lower distortion than normally
expected from such a compact cabinet.
The UMS-1P is conservatively rated at a
continuous output of 108dB SPL (127dB
peak) within its operating range of 25-
200Hz.
As with all Meyer Sound self-powered
loudspeaker systems, the UMS-1P offers
superior performance and improved reli-
ability when compared to conventional
separate speaker and amplifier combina-
tions. Because amplifiers and control
electronics are precisely matched to the
dynamic characteristics of the drivers,
self-powered systems are inherently
capable of producing more power with a
flatter response and significantly lower
distortion. The self-powered concept
also simplifies installation, eliminates
external amplifier racks and drive pro-
cessing, and avoids the losses intro-
duced by long speaker cable runs or
70/100V distributed schemes.
The UMS-1P's internal amplifier employs
Meyer Sound's complementary output
stage MOSFET design, with separate
amplifier channels dedicated to each
driver. Driver protection limiting and AC
transient suppression on the power sup-
ply ensure system reliability, while dual
locking PowerCon connectors facilitate
AC looping. A separate optional module
integrates the UMS-1P into Meyer
Sound's PC-based RMS monitoring and
control network system.
The UMS-1P's durable cabinet is con-
structed from birch plywood and covered
with a hardened, textured black finish.
A pole-mount (for supporting a UPM-1P
or other Meyer Sound product) is inte-
gral to the cabinet.
4
UMS-1P: INTRODUCTION AND TECHNICAL ADVANTAGES
AC POWER
The UMS-1P uses a PowerCon 3-pole AC
mains system with locking connectors
that prevent inadvertent disconnection.
It also has a looping feature, discussed
below, which allows multiple UMS-1Ps to
be daisy-chained. The blue connector
serves as the power input; the gray con-
nector is used in looping units together.
The unit must, of course, have the cor-
rect power plug for the AC power in the
area in which it will be used.
The power supply suppresses high volt-
age transients up to several kilovolts
and also filters EMI (radio frequencies
and noise present) on the incoming AC
voltage.
The UMS-1P can withstand continuous
voltages up to 264V and allows any
combination of voltage to GND (i.e.
Neutral-Line-GND, Line-Line-GND).
Continuous voltages higher than 264V
may damage the unit.
Voltage Requirements
Two versions of the UMS-1P are avail-
able: a switchable 115/230V and a
non-switch-able 100V-only version.
The 100V version will operate properly
when receiving between 87-113V. On
the switchable version, the voltage
switch must be checked and set at
either 115V or 230V. When set to 115V,
the UMS-1P will operate properly when
the AC remains within the range of 105-
130V. If set to 230V, the unit operates
safely and without audio discontinuity
within the range of 210-260V. Operating
outside these ranges or with the voltage
switch set improperly could damage the
unit.
After applying AC power, the system is
muted while the circuitry charges up
and stabilizes. After two seconds, the
On/Temp. LED on the user panel illumi-
nates 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
Trouble-shooting section.
The UMS-1P's power supply uses stored
energy to continue functioning for
about 10 AC cycles if the voltage
decreases below 100V or 200V (a condi-
tion known as brownout), depending on
the setting. 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
the minimum for 1 to 5 seconds. If the
UMS-1P shuts down due to brownout,
the power supply automatically turns on
if the voltage returns to the normal
operating range. If the UMS-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.
Current Requirements
Each UMS-1P requires approximately 3A
RMS max @115V for proper operation.
This allows up to five UMS-1Ps to be
powered from one 15A breaker.
Engagement
2
1
2
1
3
Separation