miniDSP DDRC-24 - Page 48

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 48
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 52.
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.
SUB_EQ Create a dip or a peak in the frequency response at low frequencies (10
to 50 Hz). This filter type is similar to PEAK but gives more accurate results for
low frequencies. Note that activating any SUB_EQ filter reduces the number of
available filters on that channel from ten to nine.
Frequency
For the PEAK and SUB_EQ filter types, 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.
Gain
For the PEAK and SUB_EQ filter types, 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.
Q
Q controls the “sharpness” of the filter. For the PEAK and SUB_EQ filter types, 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.
Bypass
The Bypass button enables or disables a filter. The filter is bypassed
if the button is "lit". (Note that all other filters are still operational
unless individually bypassed.) A filter will also have no effect if its
gain is set to 0.0.