Specifications

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
slightly more sophisticated
than the Shelving equalizer 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