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Slope 2 has a higher cutoff frequency than Slope 1, offering more control over the mid-‐
bass while creating a “dirtier” bass sound with more harmonics. On certain formats, or
when listening on a smaller radio, this may be a desirable effect.
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Slope 1+2 is simply Slope 1 followed by Slope 2. Most of the low bass will be controlled
by Slope 1 and stay nice and clean, while the remaining bass will be taken care of by
Slope 2 without affecting the low bass. If you are using heavier overall processing, this
option will give you the cleanest sound.
The Bass Clipper Threshold control sets the threshold of the Bass Clipper. Raising the
threshold (moving the slider to the left) reduces the amount of clipping performed by the
Bass Clipper, but place a greater burden on the Final Clipper. Conversely, lowering the
threshold (moving the slider to the right) will yield more bass clipping, which takes some of
the load off the Final Clipper, but may result in low frequency distortion if set too low.
The LF Protection Threshold, HF Protection Threshold, and A15 Protection Threshold
controls adjust the respective clip levels of the three protection clippers situated ahead of
the final clipper, and help protect low frequencies from influencing high frequencies and
vice versa. The various frequencies in the final wave form will always be vying for space in
the final clipper. Advancing these controls ensures their corresponding frequencies will
always have at least some room reserved in the final clipper. However, setting the
thresholds too high by advancing these controls too much will cause the sound to become
dull and dense. These are very critical controls and allow you to determine exactly what
goes into the final clipper. We strongly recommend listening very carefully to the sound
with your ears and watching the waveform on the oscilloscope very carefully when setting
these controls.
The LF Protection Threshold controls frequencies between 0 and 1,500Hz, though audio in
some of these frequencies will already have been dealt with by the bass clippers. The range
of this control is +0.0 to -‐6.0dB in one-‐tenth dB increments.
The HF Protection Threshold controls frequencies between 1,500 and 17,500Hz. The range
of this control is +10.0 to +0.0dB in one-‐tenth dB increments.
The A15 Protection Threshold controls frequencies between 15,000 and 17,500Hz. Omnia.9
is quite capable of passing audio in excess of the traditional 15kHz cutoff found in other FM
processors because of its superior pilot protection. A low threshold setting of, say, -‐12dB
allows these additional high frequencies to pass through while making sure the pilot is well
protected.
The L/R Output Bandwidth control allows you choose between 15kHz, 15.5kHz, 16kHz, or
17.5kHz for the L/R outputs.
The MPX Output Bandwidth control gives you the choice of running with 16kHz or 17.5kHZ
bandwidth on the composite outputs. Certain modulation monitors may erroneously
indicate pilot modulation when set to 17.6 kHz, even though no pilot modulation is actually
taking place.
Summary of Contents for Omnia.9
Page 2: ......
Page 8: ......
Page 103: ...95 Input Output Overview...
Page 104: ...96 MPX Input MPX Output...
Page 105: ...97 MPX Patch Point...
Page 106: ...98 Pre emphasis Patch Point...
Page 107: ...99 Undo...
Page 108: ...100 Input AGC WB AGC1...
Page 109: ...101 WB AGC3 Post Multiband...
Page 110: ...102 WB AGC3 Bass Wideband...
Page 111: ...103 WB AGC3 Bass Only...
Page 112: ...104 Multiband Processing...
Page 113: ...105 Speaker Controller...
