dbx DriveRack 240, Руководство пользователя

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Detailed Parameters
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Section 4
DriveRack
™
DriveRack™ User Manual
Section 4
Units - MilliSeconds, Feet or Meters
Selects the unit of measurement for the delay.
Length
Selects the amount of delay. Delay length will correspond directly with the selected unit of
measurement. Max Delay lengths are: 1.0 second, 1127 feet or 343 meters.
Adjustments are in approximately 20 micro-second increments. Note: When using a 2x4
crossover, the predelay for the subs is taken from channel 1.
To accommodate any audio application, the 240 and 241 DriveRack™ units offer numerous
crossover options. There are three main types of configurations found in the crossover section.
They are: Wires, Filters and Crossovers. The Wire modules simply route the signal to the appro-
priate output with no processing. The filter module allows the user to select a Wire and
a high or low band pass filter with adjustable frequency and slope. The Dual filter is a case
that splits the signal with the same filter on each output channel. The Crossover options are
grouped into 2, 3 or 4 band categories. Each Crossover gives control of 1, 2 or 3 crossover
points respectively. A crossover point is where the Lowpass and Highpass filter meet. The user
may control the Lowpass edge, or Highpass edge. 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 12-24dB/Octave (Linkwitz-Riley). In traditional analog Crossovers
using Linkwitz-Riley filters, the low and high frequencies and slopes are set equal. Within the
Crossover menu, the following parameters are available with various Crossovers.
A complete diagram of each crossover used in the 240 and 241 DriveRack™ units can be
found in section A.7 of the Appendix.
4.5.1 MONO, DUAL TRI AND QUAD FILTERS
Filter Type - Wire, Lowpass, Highpass and Bandpass
Selects the desired filter type.
Lowpass - 20Hz to 20kHz, or Out
Selects the desired Lowpass crossover frequency, or allows you to completely remove the rolloff
point.
Highpass - 20Hz to 20kHz, or Out
Selects the desired Lowpass crossover frequency, or allows you to completely remove the rolloff
point.
Low Slope - 6-24dB/Octave (filter type dependent)
Sets the Lowpass slope of the crossover filter.
High Slope - 6-24dB/Octave
Sets the Highpass slope of the crossover filter.
Type - Butterworth (BW), Bessel (BS) and Linkwitz-Riley(L-R)
Selects the desired crossover filter type.
4.5 CROSSOVER (XOVER)