Mx Series Amplifiers: Rear Panel Features; Power Connection; Circuit Breaker; Xlr Inputs - Mackie MX Series Owner's Manual

MX Series Amplifiers: Rear Panel Features

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1

1. Power Connection

This is a standard 3-prong IEC power connector.
Connect the detachable power cord (included in the
packaging with the amplifier) to the power receptacle,
and plug the other end of the power cord into an AC
outlet.
Make sure that the AC power is matched to
the AC power indicated on the rear panel
(below the IEC receptacle).
Disconnecting the plug's ground pin is
dangerous. Don't do it!

2. Circuit Breaker

The amplifier might shut down if the small load
impedance of the amplifier or the continuous input
signal are too high [clipping]. If the amplifier becomes
overloaded, reset the levels followed by pressing
and releasing the circuit breaker switch so the
amplifier can resume normal operation.

3. XLR Inputs

The input channels may accept a balanced mic signal
using an XLR connector. They are wired as follows,
according to standards specified by the AES (Audio
Engineering Society).
XLR Balanced Wiring:
Pin 1 = Shield (ground)
Pin 2 = Positive (+ or hot)
Pin 3 = Negative (– or cold)
10
MX Series Professional Power Amplifiers
5
2
SHIELD
HOT
3 1
COLD
SHIELD
1
3 COLD
2
HOT
8

4. XLR Thru Outputs

These male XLR connectors allow you to send the
balanced input signals to other amplifiers, powered
speakers, mixers, or recorders in the system. The line-
level output is a straight copy of what goes in, and the
amplifier level controls and switches have no effect.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)

5. NL4 Speaker Outputs

These NL4 outputs are typically connected to the
inputs of passive loudspeakers.
Since the connectors are wired in parallel, you can
connect a speaker to each connector, as long as the
total impedance per channel is not less than two Ω.
• Two 8 Ω speakers in parallel equals 4 Ω.
• Two 4 Ω speakers in parallel equals 2 Ω.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
NL4 Output Connector
Pin 1+ – Positive (+ or hot)
Pin 1- – Negative (– or cold)
NEVER connect the output of an amplifier
directly to a powered loudspeaker's input
jack. This could damage the input circuitry!
3 4
7 6
3 4
SHIELD 1
3
COLD 2
HOT
SHIELD
1
3 COLD
2
HOT
1–
1+
COLD
1–
1+
2+
HOT
2–