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5
Connector Information
XLR Connectors
When connecting loudspeaker cables to the
MC451 output terminals follow the steps below:
1� Make sure AC power is disconnected�
2. Rotate the top of the output terminal counter
-
clockwise until an opening appears.
Opening
Loudspeaker Connections
The MC451 is designed for two separate connec-
tions to a single loudspeaker. The solid state
the low frequency terminals of your loudspeaker.
the mid/high terminals of your loudspeaker. Any
jumpers between the low and mid/high terminals
on the loudspeaker must be removed� Refer to the
Connection Diagram on pages 10-11 for additional
information.
Loudspeaker Impedance
of your loudspeaker, determine the best impedance
to use for each connection. It is a safe bet to use
the lower impedance output terminals for a speaker
whose impedance falls between two choices.
Loudspeaker Cables
When connecting loudspeakers to the MC451 it is
very important to use cables of adequate size. The
The smaller the gauge number, the larger the wire
size.
Loudspeaker Cable Wire Gauge Guide
Loudspeaker
Impedance
Cable Distance
25 feet
(7.62 meters)
or less
50 feet
(15.24 meters)
or less
100 feet
(30.48 meters)
or less
2 ohms 12AWG 10AWG 8AWG
4 ohms 14AWG 12AWG 10AWG
8 ohms 16AWG 14AWG 12AWG
Connecting a Loudspeaker
3. Insert the loudspeaker cable into the output
terminal.
Proper polarity must be
maintained for all connections� (+/-)
4. Rotate the top of the output terminal clock-
5.
output terminal and rotate it one quarter of a
turn (90°).
Do not over tighten�
Meter/Tube
Illumination
Control
Power
Control
Ground
Signal Ground
RCA Connectors
Power Control Connectors
Output Terminals
(+) Signal Ground
(-) Signal
2
1
3
3/10 in
7.6 mm
/ in
4.4 mm
Ø
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