Wheatstone Corporation E1, Техническое руководство, Страница: 42 / 92

page 3 – 20
E-1 / Apr 2010
M A S T E R P A N E L
Reasonably conven-
tional parametric sec-
tions are employed, with
+/-14dB lift and cut ca-
pability, centre-frequency
sweepable over the range
of 16.1Hz to 20.2kHz, and
a filter sharpness (Width)
sweepable between 0.2
and 3.0 octaves. The LOW
and HIGH bands also have
a shelving function. The
entire EQ is switchable
in or out (ENABLED
switch).
Filter
HPF (High-Pass Filter) - This is a 24dB/octave variable high-pass filter with
Butterworth characteristics, tunable between 16.1Hz and 500Hz, and with a sepa-
rate in/out switch (HI PASS button). The relatively high order of filter is necessary
to allow definite and decisive removal of unwanted low-frequency artifacts (air-
conditioning rumble, line hum, traffic, or footstep impacts) with minimal effect
on the required program.
LPF (Low-Pass Filter) - This is a 24dB/octave variable low-pass filter with
Butterworth characteristics, tunable between 1KHz and 20.2KHz, and with a
separate in/out switch (LO PASS button). This filter is used to remove unwanted
high frequency artifacts (noise, squeaks, etc.) with minimal effect on the required
program.
Low and High Shelving
The high and low “shelving” EQ sections are designed to correct for real or
subjective lack in low or high frequency energy in the program material.
The low shelver (activated by the LO SHELF button) at the lower end of its
range, will enable specific kick-drum or bass guitar elements of a source to be
balanced with respect to the rest of the source; at higher frequency settings it acts
progressively more as a conventional “bass” control.
Similarly, at lower frequency settings the high shelver (activated by the HI
SHELF button) acts as a conventional “treble” control; as the frequency is raised
the effect is confined to progressively higher frequencies, allowing “sizzle” or
“sparkle” to be (re)introduced without adding the harshness that a corresponding
rise in high-mid frequencies would introduce.
At mid-point frequency settings the shelvers reasonably emulate the clas-
sic “Baxandall” style tone control, noted for its ease in rapid correction of tonal
imbalance.
page 3 – 18b
E-1 / Nov 2012