Alesis Car Amplifier MULTIMIX User Manual

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Connections
Multimix 12R Reference Manual 9
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.
Connections
Line-level devices (synthesizers, CD players,
video)
The Multimix 12R features line-level inputs on 1/4" phone jacks which
accept standard unbalanced or balanced signals.
Tip
Sleeve
Signal
Ground
Tip
Sleeve
Unbalanced Line Input
Tip
Sleeve
Hot
Ground
Tip
Sleeve
Balanced Line Input
Ring
Ring
Cold
Unbalanced -10 dBV line level sources: Most synthesizers, drum
machines, effect devices, cassette decks and CD players operate at this
level. Their average signal level is about 1/3 of a volt. They have a 2-
conductor output jack that is either a 1/4" phone or "RCA phono" type.
These may be plugged directly into any of the Multimix 12R’s [LINE
IN] jacks, with the [TRIM] level set at approximately the 1 o'clock
position. Plug stereo sources such as synthesizers, CD players, and
drum machine main outputs into the STEREO LINE channels (9/10
and 11/12) if possible.
Electric guitars and basses may be plugged directly into the [LINE IN]
jacks, if you raise the [TRIM] level. The Multimix 12R has more than
enough gain (up to 50 dB when the channel fader and trim are set to
maximum) for guitars, although some pickups may sound better if
they're plugged directly into a high-impedance preamp designed for
guitar use. Plug the output of such preamps into any [LINE IN] jack.
A reminder: do not plug a line input and a microphone input into the
same channel. The inputs are not designed to handle two sources at
the same time. If you crank up the line level input to extremes to
compensate for the level loss, you may damage the microphone.

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