miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
29
EQ band selection
Click on the tabs
EQ1
,
EQ2
, etc. to display the parameters for that filter.
Basic/Advanced
By default, each filter is in basic mode and shows the controls described below. Advanced mode
enables custom biquad programming for almost infinite flexibility in filter implementation. This is
described in
Custom biquad programming
on page 34.
Filter type
Selects the type of filter:
PEAK
Create a dip or a peak in the frequency response.
LOW_SHELF
Reduce or increase part of the frequency spectrum
below
a given frequency.
HIGH_SHELF
Reduce or increase part of the frequency spectrum
above
a given frequency.
ALL_PASS
Create a phase shift across the frequency band. This can be useful for correcting phase
issues and for simulating analog crossovers.
Frequency
For the PEAK filter type, this is the center frequency of the peak or dip. For the HIGH_SHELF and
LOW_SHELF filter types, this is the frequency at which the gain is half of the set value. For the
ALL_PASS filter type, this is the center frequency of the phase shift.
Gain
For the PEAK filter type, this is the gain in dB at the center frequency. For the HIGH_SHELF and
LOW_SHELF filter types, this is the gain in dB reached at high or low frequencies respectively. A filter
has no effect if its gain is set to 0 dB. Gain can be adjusted in increments of 0.1 dB up to +/- 16 dB. This
item is not present for the ALL_PASS filter type.
Q
Q controls the “sharpness” of the filter. F
or the PEAK filter type, lower Q gives a broader peak or dip,
while higher Q gives a narrower peak or dip. For the HIGH_SHELF and LOW_SHELF filter types, Q
controls how quickly the filter transitions from no gain to maximum gain. For the ALL_PASS filter type,
higher Q gives a steeper phase transition.
Bypass
The
Bypass
button enables or disables a filter. The filter is
enabled if the button says “BYPASS” and
disabled if the button says “BYPASSED” (see screenshot below).
Note that this button only enables and
bypasses a single filter; all other filters must be bypassed or enabled individually.
