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Connections
Multimix 12R Reference Manual 7
CONNECTIONS
Inputs
Cable common sense
Make all connections to the Multimix 12R with the power turned off
wherever possible. If you must connect or disconnect inputs while
power is on, make sure the channel fader and [TRIM] are turned all the
way down to avoid sudden pops and clicks which may damage
speakers or other equipment.
Use good-quality cable: 99% of all mixer problems turn out to be
cable or connector problems. Use the best quality cable you can, for
highest reliability and lowest noise. If something goes wrong, check
the cable and its connection to the mixer first. If the connectors are
dirty or corroded, clean them with isopropyl alcohol or other
approved electrical contact cleaner before inserting them into the
Multimix 12R. High quality cables are low-capacitance shielded cables
with a stranded (not solid) internal conductor and a low-resistance
shield. Although quality cables cost more, they do make a difference.
Route cables in your system correctly by observing the following
precautions:
Do not bundle audio cables with AC power cords.
Avoid running audio cables, or placing the Multimix 12R itself,
near sources of electromagnetic interference such as transformers,
monitors, computers, etc.
Never unplug a cable by pulling on the wire itself. Always unplug
by firmly grasping the body of the plug and pulling directly
outward.
Do not place cables where they can be stepped on. Stepping on a
cable may not cause immediate damage, but it can compress the
insulation between the center conductor and shield (degrading
performance), or reduce the cable’s reliability.
Avoid twisting the cable or having it make sharp, right angle turns.
Connections
Microphone Inputs
The Alesis Multimix 12R features eight studio-grade, low-noise hybrid
microphone preamplifiers. These [MIC] jacks are designed to work
with almost any low-impedance microphone using standard 3-
conductor XLR connectors. The [MIC] jacks also feature 48 volt
phantom power, which may be turned on and off by the [PHANTOM]
switch on the back panel, for condenser microphones which require
external powering.
Balanced Mic Input
Ground
Hot
12
3
Cold
Socket (female)
The MIC Input is designed to accept a wide range of balanced or
unbalanced low impedance input signals, with up to 60 dB of
amplification available (which is 10 to 20 dB more than many other
rack-mount mixers). It is wired with "pin 2 hot" according to the
accepted standard.
Use only one input per channel. The LINE IN jack and the MIC IN
jack of a channel can’t be used at the same time. If you turn up the
level of a line source to hear it at the same time a microphone is
connected, you may damage the microphone.