Front-Panel Connections - PRESONUS AudioBox 22VSL Owner's Manual

2 Hookup
2.1

Front-Panel Connections

Power User Tip: Never run your input levels higher than the channel inputs can handle. If you overdrive
the analog-to-digital converters, it will cause digital distortion (digital clipping), which sounds terrible.
The XMAX™ preamps in your AudioBox 22/44VSL provide plenty of headroom; take advantage of it.
Please note: When creating monitor mixes using Virtual StudioLive software, it is important
that you turn the MIxer knob all the way to the VSL position. Monitoring both the input signal
and the playback stream will create a doubling e ect that will make monitoring di cult.
6 6
48-volt Phantom Power. The AudioBox 22/44VSL provides 48V phantom power for
the microphone input on each channel. Press the 48V button to enable phantom
power for all microphone inputs.
WARNING: Phantom power is only required for condenser micro phones and
can severely damage dynamic mics, especially ribbon mics. Therefore, switch
phantom power o for all channels where it is not required.
XLR connector wiring for phantom power:
Pin 1 = GND
Pin 2 = +48V
Pin 3 = +48V
Input Gain/Trim Control. These knobs provide the following gain structure:
XLR Microphone / TS 1/4" Instrument inputs: 80 dB
of variable gain (-15/-30 dB to +65/50 dB)
TRS ¼-inch Line Level inputs (AudioBox 44VSL only):
40 dB of variable gain (-20 dB to +20 dB)
Clip Indicator. All channels feature clip LEDs next to the trim controls. The red clip
indicator LED will illuminate when the channel's input signal reaches 0 dBFS. At this
level, your mic preamp/line trim signal will exhibit signs of clipping (distortion).
Mixer. The Mixer knob allows you to blend your input signals with the playback
streams from your computer. This allows you to monitor your input signal with
zero latency. If the knob is positioned at 12 o'clock, the input signal and the
playback stream will be equally balanced. Turning the knob to the left will increase
the level of the input signal relative to the playback stream; turning to the right
will increase the level of the playback stream relative to the input signal.
Phones. The Phones knob controls the volume of the headphone output
on the front of the unit. The headphone ampli er is quite powerful, and the
volume goes to 11, so use the maximum setting with extreme caution.
Main. The Main knob controls the output level for the Main Outputs
on the back of the AudioBox, with a range of -80 dB to 0 dB.
Power (22VSL)/USB Sync (44VSL) LED. This LED will illuminate blue
when the AudioBox is properly powered and synced to a USB 2.0
connection. AudioBox 44VSL users: this LED will ash blue & red when
the unit is properly powered but no USB connection is detected.
PreSonus AudioBox 22/44VSL
™