Orban OPTIMOD-FM 5700i, Operating Manual

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OPTIMOD-FM DIGITAL OPERATION
3-47
The Two-Band Structure’s Setup Controls
The tables below show a summary of the Two-Band controls in the dynamics section.
These controls are available only from PC Remote.
AGC, Equalizer, Stereo Enhancer, and Clipper controls are common to
both Two-Band and Five-Band structures and are described in their own
sections earlier in Section 3.
Except as noted, these controls affect both the analog and HD processing
chains.
2B Drive control adjusts signal level going into the two-band compressor and there-
fore controls the density of output audio by determining the amount of gain reduc-
tion in the two-band compressor. The resulting sound texture can be open and
transparent, solid and dense, or somewhere in between. The range is –10 to 25 dB.
Regardless of the release time setting, we feel that the optimum amount of gain re-
duction in the two-band compressor for popular music and talk formats is 10-15 dB.
If less gain reduction is used, loudness can be lost. For classical formats, operating
with 0-10 dB of gain reduction (with the gain riding
AGC
set to
O
FF
) maintains a
sense of dynamic range while still controlling levels effectively. Because OPTIMOD-
FM’s density gently increases between 0 and 10 dB of compression, 10 dB of com-
pression sounds very natural, even on classical music.
2B Release control determines how fast the two-band compressor releases (and
therefore how quickly loudness increases) when the level of the program material
decreases. This release time only applies when the Two-Band Compressor is not gat-
Two-Band Controls
PC Remote Name Range
2B Drive –10 … 25 dB
2B Release 0.5 … 20 dB / S
Gate Thresh Off, –44 … –15 dB
Bass Couple 0 … 100 %
Lookahead 0 … 5 milliseconds
Master Compression Thresh –15 … 0, Off
Bass Compression Thresh –10.0 … 5.0 dB, Off
Master Attack 4 … 50, Off
Bass Attack 4 … 50, Off
2B Clipping –4 … +5
HF Limiting (located on Clippers screen) –4.0 … +2.0
HF Clip Thresh –16.0 … 0.0, Off
2B Crossover LiNoDly, Linear
MB Limit Thr –3.0 +6.0, Off
Speech Thr –4.0 ... +5.0 dB
Max Dist Ctrl 0 … 18 dB
Table 3-6: Two-Band Controls