SPL Channel One Channel Strip - Manual (Page 16)

16
Operation
Equalizer
The ”soft” and natural tonal property, characteristic of the coil-capacitor
filter, lends itself extremely well to provide clarity to vocals in the upper
frequency range thereby improving their presence. On the other hand harsh
sounds can be lent a more pleasant sound characteristic through damping.
Mid-Hi Band
The center frequency of the semi-parametric mid high frequency filter is set
with the Mid-Hi Band control. The frequency range can be set between 650
Hz and 13.7 kHz so that this filter covers a range of 4.5 octaves and can be
equally employed in the lower mid as well as the high range.
Cut/Boost (Mid-Hi)
The Cut/Boost control determines the boost, or cut of the Mid-Hi filter; the
maximum values lie between +/- 12 dB. The Mid-Hi filter utilizes the propor-
tional-Q-principle. In other words the bandwidth is dependent on the
selected boost or cut.The higher the boost or cut values are set, so the band-
width becomes narrower; by low boost or cut values the bandwidth
increases (the exact curve of the Mid-Hi filter can be seen in diagram 3 on
page 25). This filter characteristic permits a musically more sensible proces-
sing of the frequency spectrum than with constant-Q filters: if a more
thorough setting has been chosen this will lead to far preciser definition of
the frequency range to be processed. This in turn minimizes influences from
adjacent ranges.
This filter construction permits the complete scope, from selective
removal of accentuated frequencies through to character giving accentua-
tions of an instrument, to be effectively and quickly covered.
Low Band
The center frequency of the half-parametric bass filter is set with the Low
Band control.The adjustable frequency range lies between 30 Hz and 720 Hz
so that this filter covers a range of about 4.5 octaves, allowing it to be used
from the deepest bass to the lower mid range. This together with the Mid-Hi
filter ensures that the entire frequency spectrum is covered.
Cut/Boost (Low)
The Cut/Boost control determines the boost or cut of the Low Band filter; the
maximum values lie between +/- 14 dB. The Low Band filter also operates to
the proportional-Q-principle, in other words the bandwidth is dependent on
the selected boost or cut. With the Low Band filter the factor with which the
relationship of the boost or cut values, in relation to the bandwidth, is deter-
mined lies somewhat higher than with the Mid-Hi filter. The bandwidth is
therefore marginally narrower at maximum boost than with the Mid-Hi filter.
The exact curve of the Low Band filter is shown in diagram 4 on page 25.