SPL TwinTube, Руководство пользователя

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Analog Elemental Series
Back in the 1990ies, we developed an alternative way to process signals in order
to reduce sibilance based on phase cancellation. Unlike traditional compression
methods, this procedure is much more unobtrusive and simplifies control to one
single parameter. SPL‘s De-Esser quickly became a standard reference among
recording studios, broadcast stations and live sound engineers.
The most commonly used technology to remove sibilance is based on compression. In
addition to determining the threshold, the center frequency for processing must also be set.
The processing range can be up to two octaves in order to effectively address all possible
problems across the frequency spectrum. This results in one of the most critical disadvan-
tages: the wide range of frequencies being processed leads to undesired effects such as
nasalization and lisper.
The SPL De-Esser works on the principle of phase cancellation to remove unwanted sounds.
And it also adds automatic sibilance detection, which allows processing to be limited only to
the range where sibilant sounds are present. The result is a neutral-sounding, unnoticeable
but highly effective processing that never requires fine tuning level and frequency settings.
This way de-essing has the least possible influence on the voice‘s timbre, avoiding side
effects like nasalization and lisper. Operation is limited to adjusting the processing intensity
with one single control. The SPL De-Esser is a safe and precise tool to solve sibilance prob-
lems, without having to compromise sound quality nor the hassle of permanently readjusting
settings.
The Dual-Band De-Esser
The Dual-Band De-Esser module expands on this concept by making use of two frequency
bands that can be used independently or jointly.
• Two de-esser stages increase processing effectiveness without introducing any audible
artifacts
• Focused processing with high and low bands
• Input signals are automatically adjusted so that processing is uniform, regardless of the
distance between source and microphone
• Male/Female modes that adapt processing in the lower band to male or female voices
HI-Band On, Low-Band On
Use the HI-BAND ON button to turn the HIGH-S-REDUCTION on or off. Use the LOW-BAND ON
button to turn the LOW-S-REDUCTION on or off. The buttons light up when engaged.
You can use the two processing stages separately or jointly. They are connected in series as
independent de-esser modules. The low-band de-esser is set first in the chain.
If both de-essers are engaged, there is interaction between them: a signal already processed
with the low-band de-esser is different from the raw material that the high-band de-esser
would otherwise process. That is the reason why the readings of the high band‘s SR LEDs
change when the low-band de-esser is engaged while the high-band processor is active.
Hard-Bypass: the Dual-Band De-Esser module features power outage protection based on
relay-controlled hard-bypass circuits to always guarantee signal flow from input to output. In
order to keep signal flow constant, the bypass is automatically activated whenever a voltage
drop or failure is detected.
Dual-Band De-Esser | Introduction
Dual-Band De-Esser | Control Elements