Clip Indicator; Equalizer Circuit; Low Control; Low Shift Switch - Art Pro Channel User Manual

Clip Indicator

The Clip LED, located between the compressor & EQ sections, monitors the EQ section
at the input, plus several internal points. It will illuminate 6dB before the available
headroom is exceeded. When this Clip indicator lights, the level into the equalizer is
too high. Turn down either the Preamp Output control, the Compressor Output control,
or the output level of the device plugged into the compressor return insert point.
of either 40Hz or 120Hz. The low shelving filter affects all frequencies below the
corner frequency when applying boost or cut. In other words, cutting at 40Hz also cuts
30Hz, 20Hz, etc. The Low Frequency control has as range of ±12dB.
Two ranges are selected with the Low Shift Switch: 40Hz or 120Hz. 40Hz is great for
enhancing sub-low frequencies such as those in bass guitars and kick drums. Cutting
40Hz can also help to "clean up" mixes that sound muddy or "loose" in the low end.
120Hz is generally the low-end for vocals, guitars and toms. Boosting 120Hz can add
"weight" or "beef" to a week vocal and cutting it can "thin out" a signal that takes up
too much room in the low end.

Low Shift Switch

The Low Shift switch selects the corner frequency of the Low Frequency control. In the
"out" position the corner is at 40Hz. In the "in" position the corner is at 120Hz.

Lo-Mid Controls

The Lo-Mid control is a dual concentric pot (there are two controls – one outer and one
inner). The outer control is used to select a frequency while the inner control is used to
apply boost or cut. The amount of boost or cut available depends on the setting of the
Wide/Narrow (Q) switch: ±12dB for Wide and ±20dB for Narrow. Bandwidths are
approximately 1 octave and 1/3 octave, respectively. Also the Lo-Mid control can cover
two frequency ranges depending on the position of the Shift x 10 switch. These ranges
are 20Hz to 200Hz and 200Hz to 2KHz.

Equalizer Circuit

The equalizer circuit in the
Pro Channel is a tube-based,
semi-parametric, four-band
equalizer. All of the bands
overlap, giving you the
ultimate in flexibility. The
normal bandwidth of each
filter is purposely wide to
provide a very musical
sound.

Low Control

The Low control adjusts a
shelving filter with a
selectable corner frequency
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