Meyer Sound Ultra MSW-2 Specifications

MSW-2

UltraSeries™
Subwoofer

The compact, high-power MSW-2
extends the frequency range and power
bandwidth of Meyer Sound reinforcement
systems to 35 Hz. Arrayable and rugged,
the subwoofer consists of one 18-inch
cone driver capable of long excursion
with extremely low distortion, housed
in a heavily braced 2.3 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 fit­tings for ease of installation.

The MSW-2 requires a professional
quality power amplifier capable of deliver­ing up to 400 watts into 8 ohms, with a
signal voltage gain of 20 dB (minimum) 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 and arrayable

Compact and easily handled

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

MSW-2 Specifications

Acoustical – MSW-2/B-2EX System

Frequency Response

1

35 to 110 Hz +4 dB

Maximum SPL

2

Continuous 125 dB
Peak 130 dB

Acoustical Crossover Frequency 100 Hz

MSW-2 Loudspeaker

Transducers (1) MS-18 18-inch cone, 8 ohms nominal impedance
Enclosure 2.3 cu. ft. vented, multi-ply Finnish birch
Finish Black textured, 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 or

3

⁄8" - 16 or M-10 nut plates

Physical Dimensions 21

1

⁄4" W x 241⁄4" H x 201⁄4" D with grill frame and foam

Weight 66 lbs. (30 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
Safe 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 73⁄4" D

Weight 8 lbs. (3.25 kg)

Note 1:
Measured 1 meter on-axis,
half-space conditions,
pink noise input, in third­octave bands.

Note 2:
Loudspeaker driven by power
amplifier rated at 400 W into
8 ohms, weighted noise
signal source.

Note 3:
“A”-weighted, unbalanced.

The MSW-2 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 MSW-2, and incorpo­rates a summing input for deriving a mono
subwoofer signal from a stereo program.

The factory-calibrated SpeakerSense
circuitry protects the MSW-2 loudspeaker
components from damage due to over­heating under high power conditions. This
unique circuit continuously monitors the
power applied to the MSW-2 drivers, and
limits the B-2EX output when the safe
operating limits of the drivers are ex­ceeded. 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 downward from the factory setting
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 desirable to
operate the MSW-2 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
Electronics Unit

UltraSeries™ B-2EX

Power

Sense Limit

∞

20

10

8

4

3

2
1

0

Attn dB

5

6

Excursion

Safe

Out

Crossover

Safe

© 1994 Meyer Sound 04.023.003.01A

Meyer Sound Laboratories has
devoted itself to designing,
manufacturing, and refining com­ponents 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 MSW-2/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

The low frequency speaker system shall
consist of one 18" low frequency loud­speaker front-mounted in a heavily braced
hardwood-plywood bass-reflex direct-radi­ating enclosure, and a separate Control
Electronics Unit.

The Control Electronics Unit shall
contain a power supply capable of opera­ting from a 120/240V AC, 50/60 Hz line, a
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 8 ohms
shall meet the following criteria: pressure
sensitivity, 96 dB SPL measured with

1 watt of pink noise, one meter on axis;
frequency response, 35 Hz to 110 Hz plus
or minus 4 dB measured with 1⁄3 octave
pink noise, one meter on axis; output of
125 dB SPL one meter on axis with peaks
of 130 dB SPL when driven with weighted
noise. Total harmonic distortion shall
be less than 3% at 120 dB SPL one meter
on axis at 60 Hz.

Speaker enclosure dimensions are

211⁄4" W x 241⁄4" H x 20

1

⁄4

" D with grill frame

and foam, weight 66 lbs (30 kg).

Control Electronics Unit dimensions
are 19" W x 13⁄4" H x 73⁄4" D, weight 8 lbs
(3.6 kg).

The speaker system shall be the Meyer
Sound MSW-2.

The Control Electronics Unit shall be
the Meyer Sound B-2EX.

Physical Dimensions

18.25"

11.25"

12.50"

24.25"

18.25"

13.00"

21.25"

11.25"

Notes

Rigging Points
Top and Bottom

Grill (Not Shown)
Dimensions:

21.25" x 24.45" x 2"

Drawing Not To Scale

11.25"