Phantom Power - Alesis MULTIMIX 12R Reference Manual

Connections

Phantom power

Certain types of microphones (called condenser microphones) require
a DC power supply from the mixer. "Phantom power" sends 48 volts
of DC through the microphone cable. If any of your microphones
need phantom power, turn on the [PHANTOM POWER] switch on the
Multimix 12R's back panel to connect all the XLR MIC IN jacks to the
Multimix 12R's internal 48 volt phantom power source. Since the
power is applied equally to pins 2 and 3, phantom power should not
affect dynamic microphones (which do not require phantom power).
However, make sure that your microphone cables have no short
circuits or intermittent connections to avoid damage to the system.
✪
Avoid connecting or disconnecting any microphones while
[PHANTOM POWER] is turned on. Make all connections with the
Multimix 12R powered off. If this is not possible, make sure the
channel's fader and [TRIM] are down, make the connections, then turn
on the [PHANTOM POWER] switch on the back panel before bringing
the fader and [TRIM] back up. Many microphones make a loud "pop"
when first powered, so make sure your faders are down to avoid
damaging your speakers or hearing.
Never connect the MIC jack to an UNBALANCED source or to a line-
level device (such as a tape recorder or synthesizer) when phantom
power is being used.
If none of your microphones need phantom power, leave the
phantom power switch off.
Multimix 12R Reference Manual 9