Bettermaker EQ 232P Remote - Manual (Page 22)

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PEQ low frequency actual boost and cut frequencies are slightly different at the same setting
The Zen of the PEQ
The band interaction in the P-filter section is unique to its design; it has so much versatility that it’s like having
a four-band filter instead of two! With boost and attenuation on different controls, it is possible to deform the
overall response curve in a way completely different from using two bands of parametric or graphic EQ centered
on the same frequencies. This is the Zen of the PEQ, absorb it well…
Low frequency boost/cut interaction (sweetening the midrange): In the low frequency band, the mid-
frequency response changes when combining boost and cut because the attenuation (cut) filter occurs at a slightly
different frequency than the boost filter. The low frequency cut filter frequency is automatically placed an octave
higher than the boost frequency (there is no separate frequency control for the low frequency attenuation). This
has the effect of de-emphasizing the top frequencies of the boost and the frequencies above the boost. The result
is a dip in the range above the center frequency. This can help to open up the sound, without getting overly
aggressive at the center frequency. It preserves the basic tone, while still allowing you to tweak in a cleaner
and more present sound. For example, boosting the bass frequencies on a piano may cause some mud to be
perceived in the low-mid frequencies just above the bass boost due to harmonics and frequency buildup. By
adding some low frequency attenuation, these mid frequencies can be subtly (or drastically) attenuated. It’s like
having an additional parametric dip at your fingertips. The picture below shows how the most delicate colors can
be accomplished with this technique: the orange curve would normally be flat by 300 Hz but the combination
has produced a subtle dip between 300-900. The red curve is still subtle but has a more aggressive upper bass/
midrange dip.
PEQ combining a boost of 7 at 20 Hz with an atten of 2 (orange); a boost of 7 @ 20 Hz combined with an atten of 5 (red)