This is out of one of my text books, I go to the Recording Institute of Detroit, and I just finished my associate recording engineer course, and I'll be working twords the certified engineer status in about 10 months. Here it is!
50 Hz
1. Increase to add more fullness to lowest frequency instruments, like foot, floor tom, bass.
2. Reduce to decrease boom of the bass and will increase overtones and the recognition of the bass line in the mix.
This is most often used on loud bass lines like rock.
100 Hz
1. Increase to add a harder bass sound to lowest frequency instruments.
2. Increase to add fullness to guitars, and snare.
3. Increase to add warmth to piano and horns.
4. Reduce to remove boon on guitars and to increase clarity.
200 Hz
1. Increase to add fullness to vocals.
2. Increase to add fulllness to snare and guitar (harder sound).
3. Reduce to decrease muddiness of vocals or mid-range instruments.
4. Reduce to decrease gong sound of cymbals.
400 Hz
1.Increase to add clarity to bass lines especially when speakers are at a low volume.
2.Reduce to decrease cardboard sound of lower drums (foot and toms).
3.Reduce to decrease ambiance on cymbals.
800 Hz
1. Increase for clarity and punch of bass.
2. Reduce to remove cheao sound of guitars.
1.5 KHz
1. Increase for clarity and pluck of bass.
2. Reduce to remove dullness of guitars.
3KHz
1. Increse for more pluck of bass.
2. Increase for more attack of electric/accoustic guitar.
3. Increase for more attack on low piano parts.
4. Increase for more clarity/hardness on voice.
5. Reduce to increase breathy, soft sound on background vocals.
6. Reduce to disguise out of tune vocals/guitars.
5 KHz
1. Increase for vocal presance.
2. Increase for low frequency drum attack (foot/toms).
3. Increase for more finger sound on bass.
4. Increase for more atack of piano, acoustic guitar, and brightness on guitars (especially rock guitars).
5. Reduce to make background pares more distant.
6. Reduce to soften thin guitar.
7 KHz
1. Increase to add attack on low frequency drums (more metallic sound).
2. Increase to add attack to percussion instruments.
3. Increase on dull singer.
4. Increase for more finger sound on acoustic bass.
5. Increase to add sharpness to synthesizers, rock guitar, acoustic guitar, and piano.
6. Reduce to decrease "s" sound on singers.
10 KHz
1. Increase to brighten vocals.
2. Increase for "light brightness" in
acoustic guitar and piano.
3. Increase for hardness on cymbals.
4. Reduce to decrease "s" sounds on singers.
15 KHz
1. Increase to brighten vocals (breath sound).
2. Increase to brighten cymbals, string instruments and flutes.
3. Increase to make sampled Synthesizer sound more realistic.
