Alesis 2 User Manual page 36
Micro series
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- Reference manual (103 pages) ,
- Setting up (12 pages) ,
- Instruction manual (6 pages)
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MICRO EQ cont'd
The second type of equalizer is the Graphic Equalizer which
most people have seen on sound systems, some home stereos,
and many guitar type amplifiers. This device gets its name from
the fact that the control settings actually form a graph of the
frequency spectrum. While shelving equalizers work on broad
sections of the frequency bandwidth, a graphic equalizer is
s li ght l y mo r e so p h i st i ca t e d t h a n t he S he lving eq ualizer as it
divides the frequency spectrum into sections called bands. See
figure 20
FIGURE 20
The range of frequencies boosted or cut in each band is referred
to as the bandwidth. This bandwidth is normally measured in
musical octaves, so on a simple graphic equalizer containing only
5 bands, each band would have a 2 octave bandwidth, and a
more sophisticated graphic equalizer with 31 bands would have a
1/3 octave bandwidth.
Generally speaking, a 1l3rd octave equalizer is normally used
for room tuning and feedback control while a 1 or 2 octave
equalizer is used for normal tonal shaping. See figure 21
Bands
33
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