Bettermaker EQ 232P Remote - Manual (Page 20)

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EQ1/2 Topology
The EQ1/2 parametric section is based on the classic state-variable filter circuit. A filtered signal is summed
with the dry signal in phase for boost. For cuts, the dry signal is combined with the out-of-phase filtered signal
which results in perfect reciprocal curves. If you set one band to full boost, and the other band to full cut on the
same frequency, the resulting overall EQ curve will be flat with almost no phase deviation. Or you could virtually
“undo” a previous-recorded mistake if you only knew the settings of a previous equalization—but you will know,
since you will have stored those settings in the EQ232P memory! This state-variable filter design allows for a
large range of bandwidth while staying extremely stable. EQ1/2’s range reaches from 3 full octaves all the way
down to 1/5 of an octave, making an outstanding sound sculpting device.
EQ1 slopes at 500 Hz: 0.2, 0.4, 0.7, 1, 1.3, 1.6, 2, 2.5 and 3 Octaves
EQ1 boost and cut are perfectly symmetrical
EQ1/2 Band Overlap and Interaction
The EQ1 and EQ2 bands overlap within a small range of 650 Hz to 1 kHz. Within this range it is possible for
the two bands to directly interact. Being perfect reciprocal curves, when set to the same frequency with one to
boost and one to cut, they will cancel. However, in the PEQ (described below), the curves are not reciprocal, will
not cancel and have a special interaction.