Some parametric equalizers have frequencies above 20 kHz why?

[Chenjerai]

What is the purpose of audio mastering parametric equalizers having frequency options over 20 kHz?

In reality, most humans can only discern sound in the 20 Hz to 20 kHz range.

 

[Sadzandiuraye]

To make the parametric equalizer look cool and more advanced than other basic mediocre EQs which probably do the same thing anyway except you can't boost anywhere above 20,000 cycles.

 

[Queen]

Well, if you say so.

I sure know certain EQ plug-ins that are superior and reach up to 30 kHz.

 

[Munyaradzi Mafaro]

@Queen @Sadzandiuraye 30 kHz only?

There should go up to 150,000 Hz so that creative geniuses who make music for cows, beluga whales, bats, and porpoises won't have sound design and music production limitations.

 

[Tanonoka]

Ignore these guys i.e. @Sadzandiuraye @Queen @Munyaradzi Mafaro

There are some audio mastering engineers who like to use wide bells e.g. with a quality factor of Q 0.404 (3 octaves) Q 0.305 (3 ⅔ octaves) at 24 kHz to add shimmer or air to a song instead of using either a 6 dB/8va or a 12 dB/8va filter shelving filter. Although that will be slightly similar to using a 6 dB/8va at 10 kHz.

For example, and just to be a little bit technical for interest's sake check this out:

3 Octaves 12 dB/8va peak filter	6 dB/8va shelf filter equivalent
1 dB Gain @ 22 kHz	1.25 dB Gain @ 9.5 kHz
1 dB Gain @ 24 kHz	1.25 dB Gain @ 10 kHz
1 dB Gain @ 28 kHz	1.25 dB Gain @ 12 kHz