User Manual

3
2 Hookup
2.1 Front Panel Connections and Controls
Studio Series 1810c and 1824c
Owner’s Manual
2 Hookup
2.1 Front Panel Connections and Controls
Microphone/Instruments/Line Inputs. Your Studio-series interface 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.
Each microphone preamp is attached to the XLR input of the combo jack.
This convenient connector accepts either a 1/4-inch or XLR plug.
The ¼-inch TRS connectors on channels 1 and 2 can be switched
for either instrument- or line-level signals. The ¼-inch inputs on the
remaining combo connections are line-level inputs only.
Input Source. Channels 1 and 2 offer an input source selection button that lets you
switch between instrument- and line-level on the ¼-inch inputs for these two
channels. Press this button to disengage the instrument preamp when connecting
line-level devices. When the button is illuminated, the input will accept a line-level
source, such as a synthesizer or guitar amp modeler. Press this button to engage the
instrument preamp when connecting guitars or a passive bass.
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 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 Studio-series interface. 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 the life of your audio equipment.
Input Gain Control. These knobs provide 80 dB of variable gain (-15 to +65 dB) on
the microphone and instrument inputs and 40 dB of variable gain (-20 to +20 dB) on
the line inputs.
48 Volt Phantom Power. Studio-series interfaces provide 48V phantom power for
the microphone inputs. Pressing the 48V button switches phantom power on and off
for all microphone inputs; the button will illuminate in blue when this function is
switched on.
WARNING: Phantom power is only required for condenser microphones and
can severely damage some dynamic mics, especially ribbon mics. Please
consult the documentation that came with your microphone before using phantom
power.
XLR connector wiring for phantom power:
Pin 1 = GND Pin 2 = +48V Pin 3 = +48V