Frequency ranges and effect of sound quality
20-150 Hz
Those sounds are more felt than really heard. In this area it gives sense of power. But too much produces a muddy sound.
150-300 Hz
The rhythm section is here. Either a fat or thin. Too much here makes the sound too boomy. (Bass guitar, snare, toms)
300Hz-2kHz
This is probably the most important frequency range. Most instruments contain important harmonics here. Too much boosting at 300 Hz can cause horn like sounds.
1kHz and 2kHz sound tinny. Too much here sounds like a telephone. Judge well.
2-5kHz
This is upper vocal region. Too much here will cause great hearing fatigue and start to be painful. Reducing 3kHz in musical instruments brings vocals on top if your having a hard time being understood.
5-10kHz
This is presence range. This area has great achievement in overall sound. Too little sound here causes a "far away" sound.
10-15kHz
Sibilance levels can be controlled here. This area gives bright clean definition.
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