EqualizersTypes of EQ

The concept of gainIt is usually measured in dB

Positive dB = increment in signals energy

Zero dB = No change (unity gain)

Negative dB = decrement in signals energy

Infinite dB = Complete attenuation

Interesting facts of dBs

0 dB means no change in the signal

1 dB change is barely heard by some people

3 dB is the minimum perceived change of loudness for most people

10 dB change sounds twice as loud

Graphic EQIt has a fixed number of bands (frequency ranges)

Each band has ist own gain control and fixed bandwidth

10 bands are ok for music adjustments

31 bands are standard for PA systems adjustment

Graphic EQ response9-band GEQ

Each band has its own gain control (+/- dB)

The bandwidth of each band is fixed

It is good for general equalization, but it is limited for professional audio production

Shelving EQ

Also known as Bass and Treble controls

They change the hi and low end of the range

The control a very wide bandwidth

It cant control specific frequencies

Parametric EQ

It is the most complete equalizer

It can control three parameters:

Central frequency

Gain (boost or cut)

Q (bandwidth)

Q (quality factor)

It is a parameter related to the bandwidth

Low values = wide bandwidth

High values = narrow bandwidth

Low Q value

High Q value