Features
High power
High clarity and coherence
Arrayable
Rugged
Reinforcement
Loudspeaker
MSL-3A
Long-term reliability
Applications
Main PA arrays
Concert reinforcement
Theater sound reinforcement
Live music club systems
High-power announcing
Paging indoors/outdoors
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Inches
Designed to perform in a wide range of
large-scale sound reinforcement applica-
tions, the high-power, arrayable MSL-3A
allows for coherent, controlled coverage
of wide areas in theater, club and concert
sound reinforcement. The efficient loud-
speaker delivers high sound pressure levels
with extremely low distortion, for maxi-
mum intelligibility and fidelity.
vented enclosure, and a single high fre-
quency driver with a 70-degree horn. The
rugged, multiple-ply hardwood cabinet is
fitted with handles and, optionally, aircraft-
style rigging pan fittings.
The MSL-3A requires a high-quality
professional stereo power amplifier capable
of delivering up to 400 watts/channel
continuously into 4 ohms, with a signal
voltage gain of 10 dB (minimum) to 30 dB
(maximum).
The biamplified loudspeaker consists
of two proprietary 12-inch low-frequency
cone drivers in a unique horn-loaded,
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
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Connectors
Balanced Input/Output
Sense Inputs
Power
3-pin XLR (A-3) female/male
Banana jacks
120/240V AC, 50/60 Hz (internally switchable)
19" W x 13⁄4" H x 73⁄4" D, Standard rack mount
8 lbs. (3.6 kg)
Physical Dimensions
Weight
M-3A Control Electronics Unit
6
5
8
VHF
Hi
4
3
2
1
10
20
Safe
Var
HF Eq
Lo Cut
VHF
Safe
Lo
Power
0
Cal Boost Cut
∞
UltraSeries™ M-3A
Sense Limit
Attn dB
The M-3A contains logic
circuits within the sense
circuitry that monitors safe
operating conditions. In the
event of amplifier gain in
excess of 32dB, amplifier
failure or switched sense
lines, the M-3A outputs will be
muted to prevent speaker
damage.
The MSL-3A loudspeaker operates as a
system with the M-3A Control Electronics
Unit (one per channel). Optimized for the
MSL-3A and pre-aligned at the factory, the
M-3A contains frequency response and
phase response alignment circuitry, and
Meyer Sound’s exclusive SpeakerSense™
driver protection circuitry, incorporating
both peak and RMS signal limiting.
Until the onset of overload, the Speaker-
Sense circuitry has no effect on the signal.
Also provided is a switch-selectable Safe
function which widens the safety margin of
the system by decreasing the SpeakerSense
limiting threshold 6 dB, and is intended to
be used when extended periods of overload
are anticipated.
To enhance the effectiveness of the
A single-channel device operating at
line level, the M-3A is intended to be the
final component in the signal chain before
the power amplifier. Its factory-calibrated
SpeakerSense circuitry protects the MSL-
3A loudspeaker components from damage
due to overheating under high power
conditions. This unique circuit continu-
ously monitors the power applied to the
MSL-3A drivers, and individually limits the
high-frequency and low-frequency out-
puts when the safe operating limits of the
drivers are exceeded.
MSL-3A in voice reinforcement applica-
tions, the M-3A incorporates filters which
band-limit the system response under full-
power conditions. This has the effect of
increasing intelligibility by discriminating
for vocal information in the signal. In
music reinforcement applications, the
Meyer Sound DS-2 Mid-Bass Loudspeaker
and 650-R2 Concert Subwoofer are recom-
mended to extend the system’s low-
frequency response and power bandwidth.
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Meyer Sound Laboratories has
devoted itself to designing,
Architectural and
Engineering Specifications MSL-3A/M-3A
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, comprehen-
sive testing in the laboratories.
The loudspeaker system shall be of the
two-way type with two 12" low-frequency
loudspeakers front-mounted in a combina-
tion front-loaded horn constructed of
fiberglass with two removable plugs which
adjust the horn for an exponential flare, a
compression driver mounted on a high-
frequency fiberglass horn with a 2" throat.
The low-frequency and high-frequency
horns and drivers shall be securely
distortion shall be less than 0.1%. “A”
weighted noise level shall be at least 110dB
below maximum rated output of +24dBV.
The speaker system, when combined
with the Control Electronics Unit and a
stereo power amplifier rated at 400 watts/
channel into 4 ohms, shall meet the fol-
lowing criteria: Frequency response, 75 to
18,000 Hz plus or minus 4 dB measured
with 1⁄3 octave noise, 130 dB SPL of contin-
uous pink noise output at 1 meter and
peaks of 135 dB SPL. Distribution pattern,
60 degrees vertical, 70 degrees horizontal.
Speaker enclosure dimensions shall be
211⁄4" W x 563⁄4" H x 30" D, weight 241 lbs
(109.3 kg).
mounted in the bass reflex hardwood-
plywood enclosure, and the loudspeaker
shall operate with a companion Control
Electronics Unit.
Research remains an integral,
driving force behind all pro-
The Control Electronics Unit shall
contain a power supply capable of oper-
ating from a 120/240V AC, 50/60 Hz line,
electronic crossover circuitry, electronic
delay for the phase alignment of the high-
frequency horn/driver. Low and high
frequency sliding filters which automati-
cally activate under high power conditions,
RMS limiters which protect the speakers
from overheating, equalization circuitry,
active balanced input, indicator LED’s
for power on and limiters. Total harmonic
Control Electronics Unit dimensions
shall be 19" W x 13⁄4" H x 73⁄4" D, weight
8lbs (3.6 kg).
The horn loudspeaker system shall be
the Meyer Sound MSL-3A. The Control
Electronics Unit shall be the Meyer
Sound M-3A.
duction. Meyer strives for sound
quality that is predictable and
neutral over an extended lifetime
and across an extended range.
Physical Dimensions
13.36
C
15.00
30.26
30.00
21.97
10.63
7.5°
13.16
21.26
30.00
15.00
25.75
Sound
56.75
engineering
for the art
and science
of sound.
5.50
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
© 1994 Meyer Sound
04071066.02 A3
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