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Thomann's Cool Online Guides: Equalisers

3. Filters & Slope

EQs are built around
FilterA circuit used to remove or accentuate frequencies in a sound source. Common types are found on mixing consoles equalisation, synthesizers and dedicated processors such as graphic equalisers.
filter
circuits which allow some frequencies to pass and reject others. You might well have noticed in the diagram that the response the other side of the centre or ‘cutoff’ frequency does not just drop to zero instantly, but gradually decreases. This is because it is not possible to build real-time
FilterA circuit used to remove or accentuate frequencies in a sound source. Common types are found on mixing consoles equalisation, synthesizers and dedicated processors such as graphic equalisers.
filters
that are infinitely steep, and the resulting shape is called the ‘slope’ of the
FilterA circuit used to remove or accentuate frequencies in a sound source. Common types are found on mixing consoles equalisation, synthesizers and dedicated processors such as graphic equalisers.
filter
, measured in dB per octave. So for example, a 6dB per octave filter’s slope will reduce or increase
TrimThe initial gain control on a mixer or other audio device such as a mic preamp, often labelled 'gain'. Trim/gain adjustment is crucial to maintaining a clean gain structure and good signal-to-noise ratio.
gain
by 6dB for every doubling of frequency.

Frequency response of a typical
ShelvingAn equalisation circuit in which frequencies above or below a given frequency are cut or boosted evenly, as opposed to a response that slopes off on either side of a centre frequency.
shelving
EQ.
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