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3.3.3. The filters
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Sometimes EQs have filters to remove unwanted frequencies at the extreme
ends of the spectrum. It is the case of the SITRAL-295. You have a filter to
cut the extreme lower frequencies, and another one to cut the extreme higher
frequencies. The controls for these are conveniently and logically placed at both
ends. That's what makes sense, since these are the last controls for those bands;
•
These filters have a fixed slope, so you can only define the frequency where they
start cutting. Let's start from where we left off - the loudness EQ curve -, but we
will change the High and Low EQ bands first. Please click the Hz switch for the
High band and change it to 10k. Now do the same for the Low band, changing it
to 300. You'll notice that the U curve becomes more pronounced;
•
Now turn the other High Cut knob until it displays something like 19000 Hz.
Remember to use the Ctrl key together with your mouse to get a precise value;
•
Then go to the other Low Cut knob and turn it up to 30 Hz. The display curve is
now completely different, with round curves at then ends of the U;
•
These filters may come in handy to cut extremely low and high frequencies.
Frequencies below 30 Hz, for example, will not be heard, but they may push
the volume higher and prevent you from giving more gain to the audio. On the
other hand, very high frequencies may produce some audio artifacts and cause
hearing fatigue. It's up to you to decide whether these filters are needed or not.
Arturia - User Manual EQ SITRAL-295 - EQ SITRAL-295 OVERVIEW
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