PreSonus AudioBox 1818VSL - Manual (Page 11)

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Owner’s Manual
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Connec
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Comput
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Technical Informa
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Tr
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AB1818VSL Remot
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Hookup 2
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Front-Panel Connections 2.1
2.0 Hookup
2.1 Front-Panel Connections
Microphone Inputs. Your AudioBox 1818VSL is equipped with PreSonus
XMAX microphone preamplifiers for use with all types of microphones.
The XMAX has a Class A input buffer, followed by a dual-servo gain
stage. This arrangement results in ultra-low noise and wide gain control,
allowing you to boost signals without increasing background noise.
The eight analog inputs of the AudioBox 1818VSL feature combo jacks. This
convenient connector accepts either a ¼-inch phone plug or an XLR plug.
48-volt Phantom Power. The AudioBox 1818VSL provides 48V phantom power
for every microphone input, in banks of four. This feature can be individually
enabled for each bank, using the buttons on the left side of the front panel.
WARNING: Phantom power is only required for condenser micro phones and
can severely damage dynamic mics, especially ribbon mics. Therefore, switch
phantom power off for all channels where it is not required.
XLR connector wiring for phantom power:
Pin 1 = GND
Pin 2 = +48V
Pin 3 = +48V
Instrument Inputs. The ¼-inch TS connectors on channels 1 and 2 are for use with
instruments (guitar, bass, etc.). When an instrument is plugged into the instrument
input, the mic preamp is bypassed, and the AudioBox 1818VSL becomes an
instrument preamplifier.
Power User Tip: Active instruments are those that have an internal preamp or a line-level output.
Active instruments should be plugged into a line input rather than into an instrument input.
Plugging a line-level source into the instrument inputs on the front of the AudioBox 1818VSL not
only risks damage to these inputs but also results in a very loud and often distorted audio signal.
Please note: As with any audio input device, plugging in a microphone or an instrument, or
turning phantom power on or off, will create a momentary spike in the audio output of your
AudioBox 1818VSL. Because of this, we highly recommend that you turn down the channel trim before
changing connections or turning phantom power on or off. This simple step will add years to life of
your audio equipment.