Arturia TridA-Pre, Руководство пользователя

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4.5.2. The EQ section
The EQ section allows four frequency bands at any one time, with switchable but fixed
values. So, it’s what we call a switchable EQ (it has a fixed preset bandwidth, switchable
frequencies, and selectable cut/boost). One of the reasons it sounds so musical is perhaps
because of the frequencies chosen, and the way they interact, and also the fact that it
combined Shelf and Bell equalization. The frequencies are, for the Low Shelf: 50, 80, 100
or 150 Hz; Low-Mid Bell: 250, 500, 1k or 2k Hz; High-Mid Bell: 3k, 5k, 7k or 9k Hz; and High
Shelf: 8k, 10k, 12k or 15k Hz.
For those not familiar with the difference between a Shelf and a Bell (Peak) equalization
band, the differences are as follows:
A Shelf band boosts (or attenuates) all frequencies equally, above or below a certain point.
The frequency specified for a Shelf equalizer circuit is usually the point where it effectively
reaches its “shelf” state. A High Shelf EQ band boosts or cuts high frequencies and a Low
Shelf EQ band boosts or cuts low frequencies.
This is the type of circuit that’s used in Hi-Fi systems, but it is also highly musical when
applied in a recording environment.
On the other hand, a Bell (Peak) EQ band is one that, as its name implies, has a center
frequency around which the boost or cut happens. The "bell" name derives from the type of
curve drawn by the filter. The frequency range over which it reaches its bell peak and then
falls down is known as the bandwidth (or Q).
Because this design reaches a peak and then falls away, it is possible to focus on a
particular area of frequencies and make adjustments on that, without affecting those
around them. This can be particularly useful when working with instruments such as guitars
and snare drums, for example, and the Trident® A Range® became famous (among other
things) precisely for the great sound that could be achieved when processing guitars with it.
The TridA EQ section, with different
settings for each channel
20 Arturia - User Manual TriA-Pre - TridA-Pre OVERVIEW