ART Pro Audio Pro Channel - Mic Preamp/Compressor/EQ - Manual (Page 10)

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Front Panel Controls and Indicators
Preamp Circuit
Gain Control
The Gain control sets the Pro Channel’s
input gain. Turn the control clockwise to
increase gain and counter-clockwise to
decrease it. The front panel calibrations
(-11dB to +30 dB) refer to the Gain Switch
(see next section) in the “Norm” position
with the input routed to the ¼” unbalanced
input jack. Using the XLR (balanced) input
connection results in 12dB more gain, thus
making the control range from +1dB to
+42dB. When setting the Gain control, refer
to the first 10 segment Tube Character
Array (directly under the VU meter) for a
visual reference to the Pro Channel’s
internal signal levels.
Hint: The Pro Channel’s “sweet spot” is
when all four of the yellow “warm” LEDs in the Tube Character meter are lit and the
first red “clip” LED flashes occasionally.
Gain Switch
Use the Gain switch to add 20 dB of gain to the Gain control’s range (described above).
With the switch in, the gain range is +9 to +50dB using the unbalanced input (or +21 to
+62dB using the balanced input).
Note: With most microphone applications, you’ll find it necessary to use the Pro
Channel with the +20dB gain switch in. (Use the setting that best fits your application.)
Phantom Switch
The Pro Channel can power any microphone needing +48 volts DC phantom power.
Consult your microphone’s documentation to see if phantom power is required. Turning
the Phantom switch on supplies power to pins 2 and 3 of the balanced XLR input jack.
Note: Be sure to turn down or mute the output of the Pro Channel when turning
phantom power on or off. Allow 30 - 45 seconds for the power to completely dissipate