miniDSP Flex - Routing Examples; Subwoofer Integration

Preliminary
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 52
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 57.
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. For 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.