FRONT PANEL CONTROLS and JACKS
Mic Preamp Controls
The Voice Channel™ input consists of a discrete Class-A differential preamp. The circuit is optimized for low
impedance microphones as well as line level signals. Up to 60dB of gain is available from this stage. The
output can be inverted using the INVERT switch.
The impedance of the front and rear XLR inputs is continuously variable for fine-tuning the preamp to a wide
variety of mics. Phantom power is available on the XLR inputs as well.
A selectable low-cut filter removes rumble, wind noise, and pops, thereby increasing clarity.
Instrument Input
The 1/4” T/S jack on the front panel provides a high impedance unbalanced input, and when used,
automatically switches off the mic pre-amp. (The rear combo jack’s 1/4” T/R/S balanced input is lower
impedance and is part of the mic pre-amp. The rear jack is not intended to be used with high impedance
microphones or instruments.) NOTE: When using the INSTRUMENT INPUT, the PAD switch is disabled and
does NOT affect the gain.
Gain Control
This control adjusts both the mic pre-amp gain as well as the instrument input gain. The gain marked applies
to the mic pre-amp without the PAD switch depressed. The instrument input gain markings are on the right side
of the slash (/). Refer to the APPLICATIONS section to learn how to optimize the gain control for low noise
operation.
Impedance Control
This knob sets the load impedance at the front and rear panel XLR inputs of the Voice Channel™. Use the
IMPEDANCE CONTROL to subtly tune the sound of your microphone. Various microphones will change their
sound at differing load impedances. The correct setting is subjective. Adjust this control to personal taste.
Pad Switch
This switch reduces the mic pre-amp gain by up to 20dB to prevent clipping when high level mic, or line level
signals are applied to the balanced XLR or 1/4” T/R/S inputs. This switch does NOT affect the 1/4” T/S front
panel INSTRUMENT INPUT.
Phantom Power
The switch safely a48Volt phantom power to the XLR inputs. Use phantom power only when the
microphone that you are using requires it. Doing so will extend the life of the Voice Channel
as well as
reducing the possibility of shock hazard.
Invert Switch
This switch selects the output phase of the Voice Channel™. There is a 180 degree phase shift through the
Voice Channel™ when lit.
Low Cut Switch
This switch inserts a 100Hz 6dB/Oct. Low-Cut filter into the signal path. The filter is designed to remove
rumble, pops, and wind noise, yet still sound natural.
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