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Architectural and
Engineering Specifications
MSL-3A/M-3A
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
mounted in the bass reflex hardwood-
plywood enclosure, and the loudspeaker
shall operate with a companion Control
Electronics Unit.
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
distortion shall be less than 0.1%. “A”
weighted noise level shall be at least 110␣dB
below maximum rated output of +24␣dBV.
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
21
1
⁄
4
" W x 56
3
⁄
4
" H x 30" D, weight 241 lbs
(109.3 kg).
Control Electronics Unit dimensions
shall be 19" W x 1
3
⁄
4
" H x 7
3
⁄
4
" D, weight
8␣lbs (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.
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, comprehen-
sive testing in the laboratories.
Research remains an integral,
driving force behind all pro-
duction. Meyer strives for sound
quality that is predictable and
neutral over an extended lifetime
and across an extended range.
© 1994 Meyer Sound 04071066.02 A3
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
Sound
engineering
for the art
and science
of sound.
30.00
30.26
21.97
15.00
13.36
13.16
15.00
10.63
21.26
56.75
25.75
5.50
30.00
C
7.5°
Physical Dimensions