Presonus ADL 700 User Manual download pdf (Page 20)

Bass guitar can be diﬃcult to record. A consistent level with good

attack can be achieved with proper compression. Your bass doesn’t

have to be washed out in the low end of the mix. Let the compressor

give your bass the punch it needs to drive the bottom of the mix.

3.2 Equalizers

Your ADL 700 is equipped with a 4-band semi-parametric EQ. Here’s a brief

explanation of how an EQ functions, as well as some charts to help you

navigate the frequency ranges of various instruments so you can quickly

choose the best EQ settings for your recordings and live mixes.

3.2.1 What is an EQ?

An equalizer is a ﬁlter that allows you to adjust the level of a frequency,

or range of frequencies, of an audio signal. In its simplest form, an EQ will

let you turn the treble and bass up or down, allowing you to adjust the

coloration of, let’s say, your car stereo or iPod®. In recording, equalization

is a sophisticated art. Good equalization is critical to a good mix.

When used correctly, an equalizer can provide the impression of nearness

or distance, “fatten” or “thin” a sound, and help blend or provide separation

between similar sounds in a mix allowing them to both shine through the mix.

Parametric EQ

The parametric EQ and semi-parametric EQ are the most common equalizers

found in recording and live situations because they oﬀer continuous control

over all parameters. A parametric EQ oﬀers continuous control over the audio

signal’s frequency content, which is divided into several bands of frequencies

(most commonly three to seven bands). A fully parametric EQ like those in the

StudioLive 24.4.2 oﬀers control over the bandwidth (basically, the range of

frequencies aﬀected), the center frequency of the band, and the level (boost/

cut) of the designated frequency band. It also oﬀers separate control over the Q,

which is the ratio of the center frequency to the bandwidth. A semi-parametric EQ

provides control over most of these parameters but the Q is ﬁxed. Some devices,

such as the StudioLive 16.4.2 and 16.0.2, have quasi-parametric EQ, which is semi-

parametric EQ with a simple, switchable Q setting (typically, High and Low Q).

Q is the ratio of center frequency to bandwidth, and if the center frequency

is ﬁxed, then bandwidth is inversely proportional to Q—meaning that as

you raise the Q, you narrow the bandwidth. In fully parametric EQs, you have

continuous bandwidth control and/or continuous Q control, which allows

you to attenuate or boost a very narrow or wide range of frequencies.

A narrow bandwidth (higher Q) has obvious beneﬁts for removing unpleasant

tones. Let’s say the snare drum in your mix has an annoying ring to it. With a

very narrow bandwidth, you can isolate this one frequency (usually around

1 kHz) and remove, or reject, it. This type of narrow band-reject ﬁlter is also

known as a notch ﬁlter. By notching out the oﬀending frequency, you can

remove the problem without removing the instrument from the mix. A narrow

3.0 Tutorial

3.2 Equalizers

ADL 700

Owner’s Manual

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Presonus ADL 700 User Manual Page 20

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