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setting (0,2,4,…20) indicates the amount of boost, in dB, provided at just below 10 kHz. Set this control to “10”
for the exact NRSC curve.
Multiband AGC (Omnia-3fm Turbo only)
Similar in character to the wideband AGC described above, but with three bands, this section has the ability to
add power, consistency and loudness to the audio while tailoring and pre-processing it for delivery to the
multiband limiter section.
There are two additional controls here that are not in the Wideband AGC section: RTP Speed and RTP Level,
which determine what happens to the AGC gain when the Gate Threshold is reached and audio is gated. With
the RTP Level set to -5, -10 or -15 dB of gain reduction, the gain will return to that pre-defined level when
gated. How quickly the target gain reduction level is reached, is set by the remaining RTP Speed settings (Slow,
Medium or Fast). If no RTP gain reduction is desired, use the RTP Speed setting Freeze.
Note: The Freeze setting will keep the gain from decreasing when the AGC is gated (moving down on the
bargraph meter toward the RTP Level setting) but will not keep it from increasing toward the RTP Level setting
when the gate activates at a gain reduction level higher than the RTP Level setting. For example, if the RTP
Level is set to –5 dB and the gate activates while the amount of gain reduction is 10 dB, the gain will recover to
the –5 dB gain reduction level before it freezes.
Note also that due to the way in which the RTP 'circuit' works, the RTP Speed settings are somewhat affected
by the setting of the Attack time control.
Multiband Limiter
The Limiters work faster than the AGC’s and operate mostly on signal peaks that get through the slower AGC
section(s). There are three bands in the net and fm Turbo styles and 4 bands in the am style. Drive to the limiters
is controlled by the Xover in all styles except Omnia-3fm Turbo where there are Drive controls in each limiter
block. Most menu items are identical to the corresponding AGC controls. The Hold Thresh is similar in
function to the Gate Thresh in the AGC. It sets the threshold of where the limiter’s Hold algorithm begins.
When it’s in the OFF position, the limiters will attack and release as you would expect them to. With Hold
Thresh enabled, the limiters will momentarily stop and rest during very short pauses, especially during live
speech. The Limit Thresh control adjust the level at which the limiters begin to operate. Higher dB values
(CCW rotation) will result in less limiting action, and more audio signal getting to the clipper or final limiter
section.
For the fm Turbo style, the limiter Drive and Limit Thresh controls should be used sparingly, with most
frequency response contouring being done in the Xover.
Mixer
This performs the summation of the multiband sections before the final limiter/clipper. Be careful when
adjusting this section, as too much level from any particular band could cause an excessive amount of distortion
to that range of frequencies. If your desire is to “EQ” the sound, you should perform that using the drive levels
in the XOver menu, the individual limiter Drive controls (Omnia-3 fm Turbo style only), or a combination of
both. This final mixer is mainly for minor “EQ” changes to the overall sound. Adjustment of this section should
be done as a last resort.
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