Applications
Equalization for music
The Graphic Equalizer is designed not only for use in preventing feedback and equalizing uneven room frequency response to be flat, but also for equalizing frequency response to your tastes and producing favourable sound for you. Fig. 1 shows each frequency band and its corresponding auditory feeling. Fig. 2 and Table 1 show the relation between each musical instrument and its frequency band. They can be of great help in the equalizer operation. (They are referenced from a book entitled "Practical Guide for concert")
EQUALIZATION CHART
These sounds | The | rythm section | Probably | the most | Upper | vocal | re- | Presence | range. | Sibilance levels | ||||||||
are felt | more | appears here. Either | important | of | all. | gion. |
| Too | much | Great achievement | can be | con- | ||||||
than | really | a fat or thin sound | Most | all | instru- | here | will | cause | in | overall | level | can | trolled | here. | ||||
heard. | They | can | be heard by | ments |
| contain | great | fatigue, | and | be | had | here. | Too | Bright, | clean | |||
give a sense of | harmonics here. |
| loose |
| speech | in- | little causes a | "far | definition. |
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power. | Too | much | becomes | 300Hz boosting can | telligence. |
| Re- | away" sound. |
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much produces | boomy. Bass guitar- | cause |
| ducing | 3k |
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a muddy sound. | sounds. | 1k to | 2k | bring |
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| much here sounds | Figure 1 |
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| like the telephone. |
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INSTRUMENT CHART | INSTRUMENT EQUALIZATION CHART | |
| Acoustic guitar | Bass strings resonate between 70 to 120Hz, body |
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| around 300Hz. Avoid boosting these to stop feedback. |
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| 3kHz and 5kHz gives great "clarity". |
| Electric guitar | Resonances differ — depending on type. Good full |
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| sounds around 300 to 500Hz. Clarity at 3kHz. |
| Bass guitar | Extreme lows are at 60 to 90Hz. "Pick" or "pluck" |
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| sounds are around 800 to 1200Hz. Upper harmonics |
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| clarified about 3kHz. |
| Human voice | Good fullness at 150Hz. Watch for "boominess" around |
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| 250Hz. |
| Piano (Acoustic) | Bass strings resonate around 100Hz. Watch for sub- |
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| harmonics at 30 to 50Hz. |
| Piano (Electric) | Good |
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| high end. Be careful around 1.5kHz to 2.5kHz to avoid |
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| the "bar room sound". |
| Organ | Usually dies under 200Hz. Has great |
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| around 1200 to 2000Hz. Top end cuts off at 6kHz. |
| Violin | Richfullness at 400Hz. Natural mids around 1500 to |
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| 2500Hz. Avoid "scratch" sounds at 8kHz. |
| Brass instruments Watch for "hot" mids around 2kHz. Low end boost | |
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| around 400Hz. Top end clarity at 6kHz. |
| Bass drum | Great low "kick" at 40Hz. The mids at 2kHz gives the |
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| familiar "punch". |
| Snare drum | Good fullness at 100Hz. The "crack" is boosted at 2kHz. |
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| real easy. The snares extend to above 4kHz. |
| Tom Tom | The main fullness is around 200Hz. The mid punch |
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| extends to 4kHz. |
| Floor Tom | Same as tom, but extends down to 80Hz. |
| Hi Hat | Watch for the "gong" sound around 300Hz. Good |
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| "shimmer" sounds are around 8kHz to 10kHz. |
| Cymbal overhead About the same as | |
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| 150Hz. |
| Talk Box | Depending on the guitar sound driving it and the reso- |
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| nance of each player's mouth, should have great "bite" |
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| around 1200Hz and dies above 6kHz. |
Table 1
Figure 2
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