Meyer Sound UltraSeries Subwoofer USW-1 User manual

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USW
-1
UltraSeries™
Subwoofer
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
[phone]
FAX [phone]
Features
High power
Extremely low distortion
Long-term reliability
Rugged
Compact and easily handled
Applications
Road use or installations
Sound reinforcement
Concert, film, and theater
Live music clubs
Music playback systems
Bass instrument amplification

USW-1 Specifications
Acoustical – USW-1/B-2EX System
Frequency Response
1
40-100 Hz +4 dB
Maximum SPL
2
Continuous 130 dB
Peak 135 dB
Acoustical Crossover Frequency 100 Hz
USW-1 Loudspeaker
Transducers (2) MS-15 15-inch cone, 8 ohms per driver
Enclosure 5 cu. ft. vented, multi-ply Finnish birch
Finish Black textured or weather protected (optional)
Protective Grill Perforated steel screen, charcoal-grey foam covering
Connector EP-4 male, EP-5 male (Europe only)
Rigging (optional) Aircraft pan fittings,
3
⁄8" - 16 or M-10 nut plates
Physical Dimensions 31" W x 21
1
⁄2" H x 21
1
⁄2" D with grill frame and foam
Weight 115 lbs. (52.2 kg)
B-2EX Control Electronics Unit
Input Type Balanced (active), 47k ohms
Output Type Active push-pull, will drive 600 ohms
Maximum Input/Output Level
Balanced +26 dBu
Unbalanced +20 dBu
Hum and Noise
3
-90 dBV
Dynamic Range >110 dB
Sense Input 10k ohms true differential, opto-isolated
Driver Protection Circuitry RMS limiter, switchable excursion limiter
Indicators
Limit Red LED
Excursion Red LED
Sense Green LED
Power Green LED
Controls
Front Panel Input level control, AC on/off switch
Preset Panel Safe switch, Crossover Bypass switch
Connectors
Balanced Inputs/Output 3-pin XLR (A-3)
Sense Inputs Banana jacks
Power 120/240V AC, 50/60 Hz (rear-panel switchable)
Physical Dimensions 19" W x 1
3
⁄4" H x 7
3
⁄4" D
Weight 8 lbs. (3.25 kg)
Note 1:
Measured 1 meter on-axis,
half-space conditions,
pink noise input, in third-
octave bands.
Note 2:
Loudspeaker driven by power
amplifier rated at 400 W into
4 ohms, weighted noise
signal source.
Note 3:
“A”-weighted, unbalanced.

The USW-1 operates as a system with
the B-2EX Control Electronics Unit (one
per channel). Optimized for use with Meyer
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.
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.
Included in the SpeakerSense circuit
is a Safe switch, which moves the limit
point down by 6 dB and engages the
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
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.
The B-2EX Control
Electronic Unit
UltraSeries™ B-2EX Power
Sense Limit
∞
20
10 843
2
1
0
Attn dB
5
6
Excursion
Safe
Out
Crossover Safe

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.
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
following criteria: total harmonic distortion
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
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 21
1
⁄ 2 " H x 21
1
⁄ 2 " D with grill frame
and foam, weight 115 lbs (52.2 kg).
Control Electronics Unit dimensions
are 19" W x 1
3
⁄ 4 " H x 7
3
⁄ 4 " D, weight 8 lbs
(3.6 kg).
The speaker system shall be the Meyer
Sound USW-1.
The Control Electronics Unit shall be
the Meyer Sound B-2EX.
© 1994 Meyer Sound 04056036.01C2
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.
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.
Architectural and
Engineering Specifications USW-1/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