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Parametric EQ allows you to apply EQ at any point
along the frequency spectrum.
The scale of frequencies the human ear is capable of
hearing. 20Hz – 20kHZ
The
frequency spectrum is read by using a logarithmic scale, and is divided in
octaves (doubling of the frequency).
Example:
50Hz, 100Hz, 200Hz, and 400Hz etc.
| 20Hz
|
25Hz
|
40Hz
|
50Hz
|
80Hz
|
100Hz
|
160Hz
|
200Hz
|
320Hz
|
400Hz
|
640Hz
|
| 800Hz
|
1.28kHz
|
1.60kHz
|
2.56kHz
|
3.20kHz
|
5.12kHz
|
6.40kHz
|
10.24kHz
|
12kHz
|
20kHz
|
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Q is a measurement of how much the equalizer band
affects frequencies that will be boosted or reduced.
The Q setting will determine the amount of frequencies around the
center frequency, which will have a similar amount of boost or reduction.
|
Q Setting
|
Bandwidth
|
|
0.7
|
2 Octaves
|
|
1.0
|
1 1/3 Octaves
|
|
1.5
|
1 Octaves
|
|
2.9
|
½ Octaves
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The upper and lower frequencies are
defined to be the points at which the cut or boost in question is 3db less
than is being boosted or cut at the center frequency.
Example:
If your center frequency is 6 kHz, and your boost is 12db. You want to boost 9db at 4 kHz and also 9db at 8 kHz.
Q
= 6
kHZ
= 1.5
8 kHZ – 4 kHZ
If your center frequency is 12 kHz,
and your boost is 12db. You
want to boost 9db at 8 kHz and also 9db at 16 kHz.
Q
= 12
kHZ
= 1.5
16 kHZ – 8 kHZ
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