bottom end with these systems may not be possible and may result in over-stressing or
even damaging your speakers. It is generally not a good idea to use this feature without
a subwoofer. In any case, please refer to your mains’ and subwoofer speakers’ frequency
response specifications, and avoid forcing them to reproduce low frequencies that they are not
designed to reproduce.
5.4 Crossover
The Crossover is used to divide the input signal into several frequency bands. This allows the
user to drive each speaker in its optimum frequency range and send each output separately
for more efficient use of amplifier power. The DriveRack® PA+ Crossover can be configured as a
2x2, 2x3, 2x4, 2x5 or 2x6. The High frequency output is created using a High-Pass filter. The
Mid and Low outputs are created using Band Pass filters consisting of Low-Pass and High-Pass
filters. When editing Crossover parameters the frequency band is indicated by the highlighted
H, M, or L in the top left corner of the LCD display. The High-Pass or Low-Pass filter being
edited is indicated by the highlighted edge in the graphics area. For each Low-Pass filter
there are two parameters:
Frequency
Adjusts the frequency of the Low Pass filter from 20 to 20KHz.
Type
Selects the filter type. Selections are BW 6,12,18,24 for a Butterworth type filter with a slope
of 6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz-Riley filter type with slope of 12 or
24 dB/Octave.
For each High Pass filter there are three parameters and they are as follows:
Frequency
Adjusts the frequency of the High Pass filter from 20 to 20KHz.
Type
Selects the filter type. Selections are BW 6,12,18,24 for a Butterworth type filter with a slope
of 6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz-Riley filter type with slope of 12 or
24 dB/Octave.
Gain
Adjust the crossover output level for the selected output from -60 to plus 20 dB.
5.5 Output Parametric EQ (PEQ)
In addition to the graphic EQ options within the signal path, the DriveRack PA+ also offers
a 2 band low and mid and a 3-band high parametric EQ after the crossover section. The
parameters for the PEQ are as follows and are user adjustable.
PEQ On/Off
Turns the PEQ band on and off.
Section 5
Detailed Parameters
20
DriveRack
®
PA+
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