BSS Audio FDS-355 OMNIDRIVE Owner's Manual - Manual (Page 27)

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Low shape This screen is used to select the filter type/shape for the lower band edge
(high-pass) of the current output band. The band edge will be highlighted on
the graphic on the screen.
The available filter types are as follows, in this order:
Butterworth 6dB / Octave
Butterworth 12dB /Octave
Bessel 12dB / Octave
Linkwitz-Riley 12dB Octave
Butterworth 18dB / Octave
Butterworth 24dB / Octave
Bessel 24dB / Octave
Linkwitz-Riley 24dB / Octave
Butterworth 48dB / Octave
Linkwitz-Riley 48dB / Octave
Turning the parameter wheel will scroll through the above list.
Low Xover The lower edge (high-pass) of the crossover band can be set over a wide
frequency range from OUT (no roll off) through 15Hz to 16kHz. Turning the
parameter wheel anticlockwise will lower the frequency, with OUT as the
final step. Turning it clockwise will increase the frequency, to the final
clockwise position OFF, which mutes the output.
Phase The phase relationship of the two band edges at the crossover point can be
adjusted in 5 degree steps using this function. Adding any phase adjustment
will utilise an EQ filter as described in section 10.0; EQ screens. The phase is
adjusted by turning the parameter wheel.
The phase angle reference frequency is set by the high edge frequency so that
this band controls the phase between the current band, and the band above it.
Adjustments should therefore start with the highest band, and work
downwards. Note that the topmost band(s) do not have an adjustable phase
parameter.
High shape Selects the Edge filter type and slope as for the higher (low-pass) band edge.
High Xover This function works in a similar way to the Low Xover, except that OUT is the
last step at the clockwise position.
NOTE: Turning it clockwise will decrease the frequency, to the final
clockwise position OUT, which DOES NOT mute the output.