Meyer Sound Portable Speaker MSL 3A User Manual

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  
— 24  
— 21  
— 18  
— 15  
— 12  
— 9  
— 6  
— 3  
— 0  
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  
 
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 134" H x 734" 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 Sounds 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 systems low-  
frequency response and power bandwidth.  
 
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 13 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  
2114" W x 5634" 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 LEDs  
for power on and limiters. Total harmonic  
Control Electronics Unit dimensions  
shall be 19" W x 134" H x 734" 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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