ART Pro Audio ProChannel II - Manual (Page 15)

14
APPLICATIONS
Bypassing Components Of The Pro Channel II™
To bypass the vacuum tube microphone preamp: Use the preamp INSERT INPUT jack instead of the
Instrument or Mic input jack.
To bypass the Compressor/Limiter: Use the COMP bypass switch.
To bypass the EQ: Use the EQ bypass switch.
Optimizing The Preamp For Lowest Noise
The preamp of the ART Pro Channel II™ can be optimized for low noise by combining use of the PAD and
Input GAIN control for mic and line level signals. NOTE: The PAD control has no effect on the INSTRUMENT
INPUT (Front panel 1/4” input of the INPUT combo jack).
First, bypass the Compressor/Limiter, Expander/Gate and EQ. Next center the OUTPUT LEVEL control to “0”
dB of gain. The OUTPUT LEVEL LED meter can now be used to correctly indicate the clip level of the input
stage.
Second, start with the PAD in the “OUT” position and the GAIN control centered. Refer to the OUTPUT
LEVEL LED meter’s peak-hold function. Make sure that this meter never indicates clipping (the red LED is held
on after a transient). The peak-hold indicator can be in the “yellow” range or in the –5dB range of levels.
If the signal level is too high, depress the PAD switch.
Third, adjust the GAIN control to keep the peak levels in the –5dB range of the OUTPUT LEVEL LED meter.