Mackie M48 Owner's Manual - page 5
Owner
’s Manual
5
Owner’s Manual
M48 48V Power Supply: Rear Panel Features
Phantom Power
Most professional condenser mics require 48V
phantom power which lets the mixer and/or audio
interface send low-current DC voltage to the mic’s
electronics through the same wires that carry audio.
(Semi-pro condenser mics often have batteries to
accomplish the same thing.) “Phantom” owes its name
to an ability to be “unseen” by dynamic mics [Shure
SM57 / SM58, for example], which do not need
external power and are not affected by it, anyway.
Never plug single-ended (unbalanced)
or ribbon microphones into the M48.
Do not plug instrument outputs into the
M48 unless you know for certain that it is safe to do.
Be sure that the mixer’s level is down when connecting
a mic to the M48 to prevent pops from getting through
the PA.
It is not a good idea to utilize the M48
unless it is actually needed. Line-level
sources may be particularly unhappy when
they are subjected to 48V phantom powering. Many
musical instrument amps and keyboards with “direct
outputs” fit this description.
It takes approximately 15 seconds for the
phantom power to shut off completely.
Do not add or remove any mics until the
power LED is completely off or mics could be damaged.
1. Power Connector
This connection is where to connect the supplied AC
adapter to provide power to the M48. Connect the AC
adapter to the M48 first, then plug the other end into a
suitable and properly rated AC outlet.
M48s feature varying power connectors
based on country. Therefore, your power
connector may (or may not) look different
than the one displayed in the illustration.
Only use the factory-authorized power
supply that came with the M48.
2. XLR Input Jack
This XLR connector provides a balanced line-level
signal that is designed to connect to a condenser
microphone.
It is wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Input Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
NEVER connect the output of an amplifier
directly to the M48’s input jack. This could
damage the input circuitry!
3. XLR Output Jack
This XLR connector provides a balanced line-level
signal that is designed to connect to the input of a
mixer or recording interface.
It is 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)
Balanced XLR Connector
2
3
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
2
1
Balanced XLR Connector
2
1
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
M48 Rear Panel
OUTPUT
INPUT
+9V DC
3
2
1