Sound Performance Lab Classic Vitalizer 9215 - Manual (Page 12)

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Advancing the setting of the PROCESS DEPTH control simulta-
neously increases the amount of MID-HI TUNE filter and SUB BASS
signals in the mix while attenuating other midrange frequencies
to enhance the sense of loudness, thus increasing clarity, bass end
punch and overall power.
Because the PROCESS DEPTH control is really varying three
parameters at once, it is worthwhile setting aside a little time to
explore the important interaction between the PROCESS DEPTH,
SUB BASS and MID-HI TUNE controls.
This harmonic enhancement circuitry is based on fourth-order
filters and phase manipulation, effectively restoring harmonics
that have been corrupted during the recording process or by
other equipment in the processing chain. It may also be used to
increase the subjective brightness of a sound without introdu-
cing harshness. Used as an effect, this process is useful for increa-
sing the intelligibility and intimacy of vocals.
The harmonic circuitry is driven by a signal combining the
original, ”dry” signal and the output signal of the MID-HI TUNE
filter. The HARMONICS control determines how much of the
restored harmonics are added back to the original signal. Though
the circuitry of the VITALIZER is inherently very quite, please note
that applying any significant degree of high frequency proces-
sing will show up any noise present as part of the signal source.
For this reason, the signal source should be as noise-free as
possible. The harmonics control is independent of the PROCESS
DEPTH control.
Control Elements
Harmonics
Diagram:
„Curves of equal loudness“
according to psychoacoustic
researches by Fletcher and
Munson
Sound P
ressure L
e
v
el in dB
Newton/m
2
Threshold of pain Loudness level
Frequency in Hertz