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The line at the top shows a peaking equalizer with a relatively low Q-factor or wide bandwidth.
Boost level is 9dB, center frequency is 1 kHz. This type of equalizer corresponds to the typical
mid-tone control found on most audio equipment.
Red line shows a peaking equalizer with a rather high Q-factor or low bandwidth, Cut level is
-6dB. Center frequency is 100 Hz.
The line at the top shows a high shelf equalizer, the red line shows a low shelf equalizer. These
types of equalizer correspond to the typical bass and treble tone controls found on most audio
equipment.
Lo and Hi shelf equalizer:
Peaking equalizer: