PreSonus AudioBox 44VSL - Manual (Page 9)

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Owner’s Manual
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Front-Panel Connections 2.1
Hookup 2
2.0 Hookup
2.1 Front-Panel Connections
Microphone Inputs. Your AudioBox 22/44VSL 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 unwanted background noise.
Both channels of the AudioBox 22VSL (and the first two channels of the
AudioBox 44VSL) have Mic/Instrument combo jacks. This convenient
connector accepts either a ¼-inch phone plug or an XLR plug.
• 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 22/44VSL becomes an instrument preamplifier.
• Line-level Inputs (AudioBox 44VSL Only). Channels 3 and 4 of the AudioBox
44VSL have a ¼-inch, balanced TRS connection for line-level input. When
these inputs are engaged, the microphone-preamp circuit is bypassed.
Typical examples of line-level connections are synthesizer outputs, CD/
DVD-player outputs, and (with exceptions) signal-processor outputs.
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 22/44VSL 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 22/44VSL. 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.