dbx DriveRack PA, User Manual

Page: 32 / 52

Detailed Parameters
®
®
®
®
®
®
24
Section 4
DriveRack
®
PA
DriveRack ® PA User Manual
Section 4
The Subharmonic Synthesizer module has been specifically optimized to enhance Bass audio
material for use in a variety of professional applications, including nightclub and dance DJ mix-
ing, theatre and film sound, music recording, live music performance and broadcasting.
The Subharmonic Synthesizer module’s two separate bands of subharmonic synthesis provide
the best combination of smoothness and control, and the independent low frequency boost cir-
cuit is designed to get the most out of high-performance low frequency speaker systems.
Sub-Harmonic Synth - On/Off
Turns the Subharmonic Synth module on and off.
Sub-Harmonics Synth - 0 to 100%
This parameter sets the overall level of the Subharmonic Synthesizer.
24-36Hz and 36-56Hz (Subharmonic Synthesis) Level - 0 to 100%
These controls individually let you customize the amount of the respective synthesized fre-
quencies to be added in, tuning the ultimate bass response of your system to taste. For
example, if the sound is too woofy or growly, try turning down the 36Hz-56Hz level. If your
woofers are bottoming out (making a ticking, popping sound), try turning down the 24Hz-
36Hz level. You may find that a setting produces fine results in one room, but produces too
much boominess in another. If this occurs, adjust the controls as needed, (e.g., increase one
or the other of the band levels). Experimentation will pay off with smooth, full, deeply
extended bass. Remember, you are not selecting a frequency. You are controlling the overall
level of each band.
The Crossover is used to divide the input signal into several frequency bands. This allows
the user to drive the 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 2x3, 4, 5, or 6. Appendix A.5 illustrates each of the available crossovers. The High fre-
quency 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 para-
meters the frequency band is indicated by the highlighted H, M, or L in the top left corner of
the screen. 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 Butterworth type filter with slope of
6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz-Riley type with slope of 12 or 24
dB/Octave.
For each High Pass filter there are three parameters and they are follows:
Frequency
Adjusts the frequency of the High Pass filter from 20 to 20KHz.
4.4 Crossover
4.3 Subharmonic Synthesizer