Installation 5
section 3
INSTALLATION
Mounting
The M20.02, M20.03, and MS 3 fit in a standard 19 by 1.75 inch rack unit.
Connectors
The input and output are fully balanced, but can be operated in unbalanced mode without problems. The plugs are standard 3-
pin XLR connectors wired pin 1 = shield, pin 2 = (+), and pin 3 (-).
Voltage Switch
The voltage switch is found on the back of the controller. Be sure to select the voltage that matches your AC supply before
connecting and operating the controller.
Mains Connection
By using a standard IEC receptacle and mains cable, all of the international safety requirements are met.
Speaker sense cable connection
Two types of wire sets are used. Type 1 wire sets single-color wires only. The colors are blue, green, black, white, brown, yel-
low, red, and orange. Type 2 wire sets have 4 single-color wires (brown, green, blue, and orange) and 4 two-color wires (white/
brown, white/blue, white/orange, and white/green). Connect the left and right channel speaker sense input cables as described
for your type of wire set. Note: The signal polarity each cable pair does not matter.
Type 1 wire sets
The RED and ORANGE wires are not used.
• Connect the BLUE and GREEN wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel LOW FREQUENCY speaker output.
• Connect the BLACK and WHITE wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel MID FREQUENCY speaker output. (M20.03 and MS 3 only)
• Connect the BROWN and YELLOW wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel HIGH FREQUENCY speaker output.
• Similarly, connect the wires from the left channel speaker sense input cable to the amplifier’s left channel outputs.
Type 2 wire sets
The BLUE and ORANGE wires are not used.
• Connect the WHITE/BROWN and WHITE/BLUE wires from the right channel sense input cable to the positive (+)
and negative (-) terminals of the amplifier’s right channel LOW FREQUENCY speaker output.
• Connect the WHITE/ORANGE and WHITE/GREEN wires from the right channel sense input cable to the positive (+)
and negative (-) terminals of the amplifier’s right channel MID FREQUENCY speaker output. (M20.03 and MS 3 only)
• Connect the BROWN and GREEN wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel HIGH FREQUENCY speaker output.
• Similarly, connect the wires from the left channel speaker sense input cable to the amplifier’s left channel outputs.
Fuse Replacement
If the fuse blows, something is wrong. Be sure to fix the problem before replacing the fuse. Also be sure that the replacement
fuse is of the correct rating and type.
Limiter Settings
The limiter is set from DIP switches inside the cabinet. Before opening the cabinet, be sure that the main power cable is dis-
connected. The settings for Mach speakers are shown in section 5.
