Table of Contents
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1. EQ Bypass
When developing a custom set of EQ per
channel, it is sometimes helpful to bypass
the entire group of EQ to check your progress
against the starting point.
2. Filter Shape
Each filter must begin with a variation of one of
5 types.
•
Low Pass: Continuously declining output above a
cutoff frequency at a defined rate.
•
High Pass: Continuously declining output below a
cutoff frequency at a defined rate.
•
Bell: Band pass or cut filter with a defined center
frequency, boost or cut amount, and Q.
•
Low Shelf: Boost or cut frequencies below a cutoff
frequency by a fixed amount.
•
High Shelf: Boost or cut frequencies above a cutoff
frequency by a fixed amount.
For LPF, HPF, and Bell filters, choose
Butterworth 12dB/oct, Butterworth 12dB/oct
inverse, Linkwitz Riley 12dB/oct, Linkwitz Riley
12dB/oct inverse, Butterworth 24dB/oct, or
Linkwitz Riley 24dB/oct.
3. Frequency
Each filter requires that a center or cutoff
frequency be specified. You can enter this
number directly in the text box or increment/
decrement by the amount chosen in the header
row using the +/- buttons to the right. Or, you
can use the slider.
SP4 Immersive Surround Processor
4. Gain
Bell and shelving filters require that you set
the amount of boost or cut. You can enter this
number directly in the text box or increment/
decrement by the amount chosen in the header
row using the +/- buttons to the right. Or, you
can use the slider.
5. Quality Factor / Bandwidth
Bell filters require that you specify a Q. High Q
affects a narrow bandwidth, and low Q affects
a wide bandwidth. You can enter this number
directly in the text box or increment/decrement
by the amount chosen in the header row using
the +/- buttons to the right. Or, click a fractional
or multiple octave button to automatically
calculate Q.
6. Bypass / Reset
In the course of designing your filter, you may
wish to measure or listen to progress compared
to the absence of that filter. Click Bypass to
temporarily omit that filter from the aggregate
curve. Click Reset to reset that filter back to 0.
7. Copy to Channel
You may wish to duplicate your filter set to
another channel without manually rebuilding it
for each identical channel. Select a channel to
copy the current filters to and click COPY.
8. Channel Select
Select the desired channel to equalize here.
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