User Manual

2.0 Hookup
2.1 Front-Panel Controls and Connections
AudioBox
™
iOne and iTwo
Owner’s Manual
4
2.0 Hookup
2.1 Front-Panel Controls and Connections
Microphone/Instrument/Line Inputs. Both channels of the AudioBox iTwo have
Mic-Line/Instrument combo jacks that accept a ¼-inch TRS or XLR plug.
On the AudioBox iOne, Channel 1 oers an XLR jack, and Channel 2 has a ¼-inch
Instrument jack.
Please Note: As with any audio input device, plugging in a microphone or
instrument, or turning phantom power on or o, will create a momentary spike in the
audio output of your AudioBox. Because of this, we highly recommend that you turn
the input level all the way down before changing connections or turning phantom
power on or o. This simple step will add years to the life of your audio equipment.
Microphone Inputs. These XLR inputs are equipped with high-headroom
PreSonus microphone preampliers. These preamps work great with all types
of microphones including dynamic, ribbon, and condenser microphones.
Power User Tip: Dynamic microphones and ribbon microphones (which are a special
type of dynamic mic) are generally lower-output devices that, with few exceptions,
require no external power source. Sending phantom power to a ribbon mic that
doesn’t require it can cause severe damage to the mic—usually beyond repair.
Condenser microphones are generally more sensitive than dynamic and ribbon
microphones and typically require external +48V phantom power. Always review your
microphone’s documentation and follow its recommended operating practices.
Instrument Inputs. These ¼-inch connectors are for use with instruments that don’t
have internal preamps (guitar, bass, etc.). See Input Source Button for more
information.
Power User Tip: Active instruments are those that have an internal preamp and a
line-level output. This type of instrument should be plugged into a line input, rather than
an instrument input. Plugging a line-level source into the instrument inputs not only risks
damage to these inputs but also results in a very loud and often distorted audio signal.
Line Inputs. The ¼-inch connectors on the AudioBox iTwo can
also accept line-level inputs such as keyboards and samplers.
See Input Source Button for more information.