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Operating Instructions
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
MSL-10A
Loudspeaker
1. Single cabinets. First, verify polarity of the bottom
two woofers by connecting a 9 volt battery at the end of
the loudspeaker cable.
Pyle connector Battery
Pin 1 + terminal
Pin 2 – terminal
• The woofer cones should move outward.
• Repeat this check with the second pair of woofers by
connecting pin 3 to battery +, and pin 4 to battery –.
Again the woofer cones should move outward.
• Reconnect the loudspeaker cable to the MSL-10A
amplifier/drive rack.
• Input the pink noise source to the M-10A and ad-
vance its level control to a convenient measuring
level.
• Standing in front of the loudspeaker, position the
analyzer microphone directly between the HF horns
section and the 12-inch drivers, at a right angle to the
cabinet face, and about 1 meter in front of the
MSL-10A.
• If polarity of the high frequency drivers is reversed, a
trough will appear in the response curve centered
near 800 Hz. If in doubt, reverse the polarity of the
Hi amplifier output while you watch the analyzer
display.
2. Multiple cabinet arrays. Each cabinet should first
be tested as above.
• Connect one loudspeaker and advance the pink
noise to a convienent measuring level. Position the
measuring microphone on the axis between the
loudspeaker and the cabinet adjacent to it, and
about 2 meters distant. Note the frequency re-
sponse and overall level.
• Leaving the first loudspeaker connected, connect
the adjacent one and observe the analyzer display.
The entire curve should jump up in level, indicating
correct addition between the loudspeakers. A polar-
ity reversal between the loudspeakers will show up
as severe broadband cancellation.
• Similarly, add in the rest of the cabinets of the array
one at a time, looking for correct addition as each
loudspeaker is connected. (It will be necessary to
reposition the microphone.)
Physical
Dimensions
33.20
24.66
41.00
81.75
.875 Ø thru
HF service access
Speaker connector
AC power indicator
AC power inlet
Circuit breaker
LF service access
3.50
33.20
31.57
19.187
Fork lift bracket
Spacer/hanger bar
85.0084.5078.75
15°
6.20