Features
High power
Extremely low distortion
Long-term reliability
Rugged
UltraSeries™
Subwoofer
Compact and easily handled
USW-1
Applications
Road use or installations
Sound reinforcement
Concert, film, and theater
Live music clubs
Music playback systems
Bass instrument amplification
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Inches
The compact, high-power USW-1
extends the frequency range and power
bandwidth of Meyer Sound reinforcement
systems to 40Hz. Accurate and rugged,
the subwoofer consists of two 15-inch
cone drivers capable of long excursion
with extremely low distortion, housed
in a heavily braced five cubic foot vented
enclosure of multiple-ply hardwood.
Fitted with handles, the roadworthy
cabinet has a durable, textured finish and,
optionally, aircraft-style rigging pan fit-
tings for ease of installation.
The USW-1 requires a professional qual-
ity power amplifier capable of delivering
up to 400 watts into 4 ohms (this normally
corresponds to a 250 watt/8 ohm rating),
with a signal voltage gain of 20 dB (mini-
mum) to 30 dB (maximum).
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
The B-2EX Control
Electronic Unit
6
5
8
4
Safe
Crossover
Out
3
2
1
10
20
Excursion
Power
Safe
0
∞
UltraSeries™ B-2EX
Sense Limit
Attn dB
The USW-1 operates as a system with
the B-2EX Control Electronics Unit (one
Included in the SpeakerSense circuit
is a Safe switch, which moves the limit
per channel). Optimized for use with Meyer point down by 6 dB and engages the
Sound subwoofers, and pre-aligned at the
factory, the B-2EX contains frequency
response and phase response alignment
circuitry, and Meyer Sound’s exclusive
SpeakerSense™ driver protection circuitry,
incorporating RMS signal limiting and
switchable excursion limiting.
excursion limiter. This has the effect of
increasing the safety margin of the system,
and is intended to be used when extended
periods of overload are anticipated. In
addition to these features, the B-2EX
incorporates a Crossover switch which
engages/disengages the lowpass rolloff of
the subwoofer output. This feature may be
used whenever it is desireable to operate the
USW-1 full-range as, for example, in
instrument amplification
A single-channel device operating at
line level, the B-2EX is intended to be the
final component in the signal chain before
the power amplifier. It is connected in
parallel with the input to the system being
supplemented by the USW-1, and incorpo-
rates a summing input for deriving a mono
subwoofer signal from a stereo program.
The factory-calibrated SpeakerSense
circuitry protects the USW-1 loudspeaker
components from damage due to over-
heating under high power conditions. This
unique circuit continuously monitors the
power applied to the USW-1 drivers, and
limits the B-2EX output when the safe
operating limits of the drivers are ex-
ceeded. Until the onset of overload, the
SpeakerSense circuitry has no effect on the
B-2EX output signal.
The setup controls are located behind
a cover plate on the B-2EX front panel,
providing a means for securing the system
installer’s presets.
Architectural and
Engineering Specifications USW-1/B-2EX
Meyer Sound Laboratories has
devoted itself to designing,
manufacturing, and refining com-
ponents that deliver superb sonic
reproduction. Every part of every
component is designed and built to
exacting specifications and
undergoes rigorous, comprehensive
testing in the laboratories.
The low frequency speaker system shall
consist of two 15" low frequency loud-
speakers front-mounted in a heavily braced
hardwood-plywood bass-reflex direct-radi-
ating enclosure, and a separate Control
Electronics Unit.
1 watt of pink noise, one meter on axis;
frequency response, 40 Hz to 100 Hz plus
or minus 4 dB measured with 1⁄3 octave
pink noise, one meter on axis; output of
130 dB SPL one meter on axis with peaks
of 135 dB SPL when driven with weighted
noise. Total harmonic distortion shall
be less than 3% at 130 dB SPL one meter
on axis at 60 Hz.
Speaker enclosure dimensions are
31" W x 211⁄2" H x 211⁄2" D with grill frame
and foam, weight 115 lbs (52.2 kg).
Control Electronics Unit dimensions
Research remains an integral,
driving force behind all production.
Meyer strives for sound quality that is
predictable and neutral over an
extended lifetime and across an
extended range.
The Control Electronics Unit shall
contain a power supply capable of opera-
ting from a 120/240V AC, 50/60 Hz line, a
master level control, an active crossover
set at 95 Hz, an RMS limiter for speaker
protection, a switchable excursion limiter,
and two active balanced summing inputs.
The Control Electronics Unit shall meet the are 19" W x 13⁄4" H x 73⁄4" D, weight 8 lbs
following criteria: total harmonic distortion (3.6 kg).
less than .1%; “A”-weighted noise level
110dB below rated output of +26 dBu.
The speaker system, its companion
Control Electronics Unit, and a power
amplifier rated at 400 watts into 4 ohms
shall meet the following criteria: pressure
sensitivity, 101 dB SPL measured with
The speaker system shall be the Meyer
Sound USW-1.
The Control Electronics Unit shall be
the Meyer Sound B-2EX.
Sound
engineering
for the art
and science
of sound.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(
510) 486-1166
FAX (510) 486-8356
© 1994 Meyer Sound
04056036.01C2
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