PreSonus AudioBox™ iOne 사용자 매뉴얼

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Input Source Button (AudioBox iTwo). Each AudioBox iTwo input channel offers an 

Input Source button that lets you select instrument or line level for the ¼-inch inputs. 

When the button is not illuminated, the input will accept a line-level source, like a 

synthesizer or guitar amp modeler. Press this button to engage the instrument 

preamp when connecting guitars or a passive bass.
48-volt Phantom Power. The AudioBox iOne, and iTwo provide 48V phantom power 

for the microphone inputs. Pressing the 48V button switches phantom power on and 

off for the microphone inputs, and it will illuminate in blue whenever this function is 

switched on.

WARNING: Phantom power is only required for condenser microphones and 

can severely damage some dynamic mics, especially ribbon mics. Therefore, 

switch phantom power off when it is not required.

XLR connector wiring for phantom power: 
Pin 1 = GND    Pin 2 = +48V    Pin 3 = +48V
Input Gain Control. These knobs provide 52 dB of variable gain (-10 to +42 dB) on 

the microphone inputs and 51 dB of variable gain (-24 to +27 dB) on the 

instrument inputs.
Input Signal Indicators. Each channel features an LED next to the trim control 

that illuminates in green whenever an input signal is present. The color of the 

LEDs will change to red when the channel’s input signal reaches -0.5 dBFS. At 0 

dBFS your mic preamp/line signal will exhibit signs of clipping (distortion).
Power User Tip: Never run your input levels higher than the channel 

cause digital distortion (digital clipping), which sounds terrible.
Direct Monitor Mix Control (AudioBox iTwo). The Mix knob allows you to blend 

your input signals with the playback streams from your computer. This allows you to 

monitor your input with zero latency. If the knob is positioned at 12 o’clock, the input 

and playback will be equally balanced. 
Turning the knob to the left increases the level of the input relative to the playback; 

turning it to the right increases the level of the playback relative to the input.
Please Note: When creating monitor mixes using Studio One or 

another DAW, it’s important that you turn the Mix knob all the way to 

the Playback position. Monitoring both the input and the playback 

will create a doubling effect that makes monitoring difficult.
Direct Monitor Mix Control (AudioBox iOne). The Direct button blends the source 

of what is heard through the Headphone and Main outputs in the following manner:

 • In the Off, or “up,” position (default), you’ll only hear 

the playback from your computer.

 • When the button is in the On, or “down,” position, the button will 

illuminate in blue, and you’ll hear a 50/50 blend of the playback from 

your computer and the input signal going into the interface.

Headphone Output. This ¼-inch TRS connector is where you connect headphones 

to your AudioBox interface. 

 

Headphone Knob. This knob controls the volume of the headphone. The 

headphone amplifier is quite powerful, and the volume goes to 11, so use the 

maximum setting with extreme caution.