ART Pro Audio Pro Channel - Mic Preamp/Compressor/EQ - Manual (Page 16)

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“surgical” cutting of a frequency band without affecting adjacent frequencies too much.
High Control
The High control adjusts a shelving filter with a selectable corner frequency of either
6KHz or 18KHz. The two frequencies are selected with the High switch (see below).
The high shelving filter affects all frequencies above the corner frequency when
applying boost or cut. In other words, cutting at 6KHz also cuts 7KHz, 8KHz, etc. The
High Frequency control has as range of ±12dB.
High Switch
The High switch selects the corner frequency of the High control. In the “out” position,
the corner is 18KHz. In the “in” position, the corner is 6KHz.
6KHz is great for adding top end to guitars, snare drums and vocals. Cutting 6KHz can
also help to take the edge off brittle or harsh sounding instruments.
18KHz may be used to add “sizzle” to cymbals and is generally referred to as the “air”
band. While there aren’t many instruments that contain 18KHz information directly,
many instruments and mixes contain upper harmonics that can add extra definition and
space when boosted. Cutting at 18KHz can decrease hiss and noise.
Note: The High and Hi-Mid controls intentionally overlap to give you greater
flexibility. For example, on cymbals try boosting 18KHz with the High control while
cutting 20KHz with the Hi-Mid control for a bright, yet noise-free result.
EQ Bypass Switch
A Bypass switch is included in the equalizer circuit to enable you to remove it from the
signal chain. When set to its Bypass position (in), signal passes from the compressor
circuitry to the output tube section with no equalization. The red LED lights when
Bypass is engaged. In its Norm position (out), the equalizer is active. Use the EQ
Bypass switch to compare your equalized and unequalized sound – a reality check to
make sure you are making an improvement! It may be necessary to adjust the Master
Output control to balance the apparent level of the EQ’d and un-EQ’d signal.