dbx PX, User Manual, Page: 29 / 48

the number of Fixed filters goes down, then the last fixed filter set will be reset. Likewise, if
the number of Fixed filters goes up (and thus the number of live filters goes down), then the
last live filter set will be reset. The Fixed/Live filter usage will be indicated at the bottom
of each page of the feedback elimination effect. ‘F’ indicates an available fixed filter, and ‘L’
indicates an available live filter. A blocked out F or L indicates a filter that is set, or in use.
Live Filter Lift (On/Off)
This parameter turns the Live Filter Lift on and off.
Lift After - 5 sec to 60 min
This parameter allows the user to setup the box so that the Live filters will automatically
be removed after a set time (as indicated by the “Lift After” parameter). It ranges from 5
seconds to 60 minutes. This feature is useful if the microphone being used is moved or the
characteristics of the venue change over time. As an example, a filter placed minutes ago will
not likely be presently preventing feedback. This feature removes unnecessary filters from the
spectrum to ensure sonic quality. If the feedback is still there (after the filter is removed), it
will catch it and notch it out again.
5.3 Subharmonic Synthesizer
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
mixing, 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
circuit 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
frequencies 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. 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.
IMPORTANT!
The Subharmonic Synthesis process creates very low frequency audio material
that your powered speakers may not be designed to reproduce. Attempting to achieve
DriveRack
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PX
Section 5
Detailed Parameters
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