New Media Technology Omnia ONE Multicast - Manual (Page 30)

The last option, adjusting the Mixer, is designed to provide a final minor trim to the audio spectrum. Since this stage
is after all of the dynamic multi-band AGC and Peak Limiting, a radical change in level in the Mixer could result in
excessive look-ahead final limiting in that band’s frequency range. We suggest that any changes implemented here
be limited to about 0.5 dB to 0.7 dB of boost maximum. Alternately, a decrease in mix levels can be done in any
desired amount and without fear of final limiter overdrive.
Thunder Bass
OmniaONE Multicast has the power to shake the walls with low end! If your source material has it, OmniaONE
Multicast can expose that deep bass and do it with muscle! Tailoring Thunder Bass for more dominance is simple,
and is done by adjusting the following parameters and in the order listed:
1. Increase the amount of Bass boost in the Enhance section.
2. Increase the Drive to Low Frequency Limiter.
3. Increase the Release setting in the Low Frequency Limiter.
Just as in the section on ‘overdoing’ processing, again moderation is the key. If all of the above changes are made in
unison there is a possibility of severe low frequency buildup. This would unbalance the audio spectrum and produce
the illusion of “lost” presence and high frequencies.
Generally, an increase in the Bass boost alone will provide a sufficient enhancement to the low end. Bass
adjustments should typically be done after selecting the preset you wish to use and the low pass filter that is
appropriate for the codec to be used.
Adjusting processing for coded audio is different than conventional radio. While many of the dynamics functions are
the same, i.e. compression, limiting, EQ, etc, please consider that the audio processor is a tool to improve the
performance of the codec. This is especially true at lower bitrates. When making processing adjustments, try to
avoid building too much density in the presence and high frequency ranges. Density in this spectra cause codec
efficiency to become reduced and artifacts increased.
Even though Sensus
® technology is applied downstream from the main processing and will improve system
performance, remember that the processor is a sum of its collective dynamics parts and the result will be based on
the cumulative effect of all of the settings. When adjustments are being made pay particular attention to program
content that segues from music to voice and back again. If everything is working properly the vocal quality should
not change due to the coding process. If this is noticed, try reducing the Sensus
® function value by one adjustment
click and then reevaluate.
OmniaONE Multicast - Use and Operation Manual – Version 0.90
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