Wheatstone D-8000, Техническое руководство

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D-8000 / Jan 2003
D Y N A M I C S P R O C E S S I N G C O N T R O L M O D U L E
Signal Processing Controls
Input Gain
This has a gain swing (in digital) of +/-14dB to compensate for:
(+) inadequate incoming level on a source,
(-) depression of input signal to retain headroom if large amounts of
equalizer boost is incurred.
Balance
To compensate for left/right imbalanced program sources, or to posi-
tion mono, or mono-like sources within the sound-stage. It has a “law” that
allows smooth image positional shifts without compensatory adjustments
in level.
High-Pass Filter
This is a 24dB/octave variable high-pass filter with Butterworth
characteristics, tunable between 20Hz and 500Hz, and with a separate
in/out switch (“HPF” switch). 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. The character of the
filter is a compromise between sharpness of transition / steepness of roll-
off and undesired in-band sonic effects.
Equalizer
This consists of high and low frequency “shelving” sections, each of
variable frequency and lift/cut, in addition to a pair of parametric EQ
sections of variable level, frequency and bandwidth. The entire EQ is
switchable in or out (“EQ” switch).
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 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 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
classic “Baxandall” style tone control, noted for its ease in rapid correction
of tonal imbalance.