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Section 4
DriveRack
™
DriveRack™ User Manual
Section 4
Lowpass, Highpass or band pass filter with adjustable frequency and slope. The Dual filter is
a case that splits the signal with a filter on each channel. The Crossover options are grouped
into 2, 3 or 4 band categories. Each Crossover give control of 1, 2 or 3 crossover points respec-
tively. A crossover point is where the Lowpass and Highpass filter meet. The user may con-
trol the Lowpass edge, Highpass edge or both using the Center fc parameter. The Crossover
type allows selection of Butterworth, Bessel or Linkwitz-Riley filter types with roll-off or slopes
of 6-24dB/Octave (Butterworth and Bessel) or 12-48dB/Octave (Linkwitz-Riley). In traditional
analog Crossovers using Linkwitz-Riley filters, the low and high frequencies and slopes are set
equal. With the Crossover menu, the following parameters are available with various
Crossovers.
A complete diagram of each crossover used in the 480, 481 and 482 DriveRack™ units can
be found in section A.7 of the Appendix.
4.5.1 1X1, 2X2,
3X3, 4X4 FILTERS (N/A 442)
Filter Type - Wire, Lowpass, Highpass and Bandpass
Selects the desired filter type.
Lowpass - 20Hz to 20kHz
Selects the desired Lowpass crossover frequency.
Highpass - 20Hz to 20kHz
Selects the desired Highpass crossover frequency.
Low Slope - 6-24dB/Octave
Sets the Lowpass slope of the crossover filter.
High Slope - 6-24dB/Octave
Sets the Highpass slope of the crossover filter.
4.5.2 DUAL FILTER (N/A 442)
Filter Type 1 - Wire, Lowpass, Highpass and Bandpass
Selects the desired filter type.
Lowpass 1 - 20Hz to 20kHz
Selects the desired Lowpass crossover frequency.
Highpass 1 - 20Hz to 20kHz
Selects the desired Highpass crossover frequency.
Low Slope 1 - 6-24dB/Octave
Sets the Lowpass slope of the crossover filter.
High Slope 1 - 6-24dB/Octave
Sets the High pass slope of the crossover filter.
Filter Type 2 - Wire, Lowpass, Highpass and Bandpass
Selects the desired filter type.
Lowpass 2 - 20Hz to 20kHz
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