Operating Instructions
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
M-5
Control
Electronics
Unit

The Meyer Sound M-5 is an ac-

tive signal processor designed

for use with the MSL-5 loud-

speaker. It is a single channel

device, and it occupies a single

13⁄4-inch rack space. The func-

tions of the M-5 are:

• Active crossover for bi-
amplification.
• Loudspeaker frequency
response and phase
response alignment.
• MultiSense™ driver
protection.
The M-5 operates at line level and is designed to be the
last component in the signal chain before the power
amplifiers. Connections to the M-5 should be made
according to Diagram A.
1. Signal Inputs to the M-5 should be balanced. For
the best signal-to-noise ratio, the average input level
should be at least 1 volt RMS. The M-5 will accept
peak inputs of up to +26 dBV.
Note: The M-5 utilizes Meyer Sound’s exclusive ISO™
Input. Pins 1, 2 and 3 are transformer-isolated, and the
connector shell is connected to earth ground (pin 3
positive for positive pressure out from the MSL-5).
2. MultiSense™ connections are made from the
outputs of the power amplifiers to the M-5 Sense
inputs. The output(s) of the High power amplifier(s)
must be connected to the Hi Sense inputs, and the
output(s) of the Low power amplifier(s) to the Lo
Sense inputs in order for the MultiSense driver protec-
tion circuitry to operate properly.
Note: These inputs are polarity-sensitive: be certain
that they are connected as indicated on the M-5 rear
panel.
3. The signal Outputs from the M-5 are active bal-
anced. The maximum output level before clipping is
+26 dBV.
4. Connections between the power amplifier outputs
and the MSL-5 loudspeaker should be made according
to the MSL-5 Operating Instructions. These connec-
tions must be verified for correct polarity, and cor-
rect amplifier assignments (high to high, low to low).
Color codes given in the diagrams are those used for
Meyer Sound cables and adapters.
Connections
PUSH
+–
PUSH
+–
Hi Amplifier:
Type 3 Amplifier with 16 dB fixed voltage gain.
Lo Amplifier:
Type 3 Amplifier with 16 dB fixed voltage gain.
Hi Sense Cable
Lo Sense Cable
Lo Input
Lo Output
Hi Input
Hi Output

Diagram A: Connections for use with MSL-5

4
3

12

(Black)
(Red)
Out to MSL-5
Input
Lift
GND
Input Hi Sense Lo Out Hi Out 1/4 A SloBlo
90-105
105-125
210-250
180-210
AC Voltage
+
-
+
-
+
-
+
-
90-250 VAC
50-60 Hz
100mA MAX
CAUTION:
Set voltage before applying power.
AC Voltage Ranges
210 - 250
180 - 210
105 - 125
90 - 105
Lo Sense
PUSH