Using The Low And High Filters On Audio; Low And High Eq - Focusrite Green Range Manual

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Using the Low and High Filters on Audio

The Low and High filters are usually used to correct problems with a signal rather
than being used in a creative way (for example, to create a special effect).
Use the Low filter to remove:
• Unwanted rumble.
• Bass lift (a proximity effect of microphones, giving a bass boost as the singer gets
closer to the microphone). This is most apparent with unidirectional microphones.
• Hum from noisy sources.
Use the High filter to remove:
• Unwanted hiss.
• High-frequency bleed-through from other sources when recording bassy signals
(such as bass drum).
One possible creative use of the filters gives an effect similar to a telephone. To
achieve this effect, use the filters to dramatically reduce the frequencies allowed
through the unit (for example, set the Low filter at 100Hz and the High filter at 3kHz).

Low and High Eq

The Low and High Eq affect all frequencies below or above a given frequency, letting
you attenuate (reduce the volume of) the signal, or add gain to it. Thus, the Low Eq
lifts or cuts the low-frequency end of the frequency spectrum, and the High Eq lifts or
cuts the high-frequency end – using them together you can, for example, boost the
low end and cut the high end of the frequency spectrum, so appearing to tilt the
frequency response towards the low end.
Controls
• Freq sets the frequency below which (for the Low Eq) or above which (for the
HighEq) all frequencies are affected.
• dB sets the amount of attenuation or gain applied to the affected frequencies.
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