OCTAVE SELECTOR
Equalizers generally express the range
of their effect in terms of octaves
instead of specific frequencies. An
octave is the distance between one
frequency and another that is twice as
high (100 Hz and 200 Hz, for
example). The A string on a guitar is at
110 Hz, so the A note at the octave
(12th fret) is 220 Hz, and an octave
higher is 440 Hz. Notice that the
relationship is the doubling (2 times),
rather than the frequency, since the
difference between 110 and 220 is
110, and the difference between 220
and 440 is 220. This is why it's easier
to express the bandwidth, the
frequency range affected by the Dual
Parametric D.I.'s Band, in terms of
octaves.
The Dual Parametric D.I.'s bandwidth
is adjustable from .015 octaves to 2
octaves, a huge range. For example, at
1kHz (1,000 Hz), a bandwidth of .015
octaves is 15 Hz. At 100 Hz, that
would be 1.5 Hz. These are extremely
tight settings. Even at 20kHz-
approximately the top limit of human
hearing-a bandwidth of .015 octaves
translates to only 300 Hz. Narrow
bandwidths are great for selectively
chopping out feedback frequencies, 60
Hz hum, etc. Wider bandwidths mean
that the equalizer affects a wider range
of frequencies.
DUAL PARAMETRIC D.I.
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