Orban OPTIMOD-PC 1101 Operating Manual page 168

3-48
OPERATION
In the Five-Band structure, the sum of band 1 and 2 drives the clipper. In the Two-
Band structure, the Bass band drives the clipper.
Bass Clip Shape allows you to change the knee of the input/output gain curve of
the bass clipper. It allows you to control the shape of the "knee"—the transition be-
tween no clipping and flat topping. "0" provides the hardest knee, where the tran-
sition between linear operation and flat topping occurs abruptly as the clipper's in-
put level is changed. "10" is the softest knee, where the transition starts 6 dB below
setting and occurs gradually. The factory default setting is "7.6."
B C T
ASS LIP HRESH
See Figure 3-4 on page 3-47.
Final Limit Drive control adjusts the level of the audio driving the low-IM look-
ahead limiter that OPTIMOD-PC uses to control fast peaks, thereby adjusting the
peak-to-average ratio of the processed audio. The F
determines the loudness/distortion trade-off.
Turning up the F
L
INAL
ing the peak-to-average ratio, and increasing the loudness on the air. When the
amount of limiting is increased, the audible intermodulation distortion caused by
limiting increases, even though special algorithms minimize the increase compared
to less sophisticated designs. Lower settings reduce loudness, of course, but result in
a cleaner sound.
When you use OPTIMOD-PC in a preemphasized mode (step 5 on page 2-25), this
inserts a frequency-dependent high frequency boost before the look-ahead limiter.
This boost can be as large as 20 dB at 20 kHz. When using preemphasis, you must
turn down the F
L
INAL
ing audible gain pumping.
You may find it illuminating to recall several Factory Presets, adjust L
M to several points in its range, and then open the Full Control screen
ORE
to examine the trade-offs between the release time and F
made by the factory programmers. However, note that all Factory Presets
were created to complement F
must turn down the F
Transient Enhance is mainly useful in mastering. This control allows you to insert
an audio delay in the sidechain of the five-band compressor. By delaying the gain
control signal, this allows attack transients to pass through the multiband compres-
sor uncompressed, which can increase punch. There is a tradeoff between this con-
trol and the activity of the look-ahead limiter, which will have to eliminate attack
Distortion Control Adjustments
Name
Bass Clip Threshold
Speech Bass Clip Threshold
Bass Clip Shape
Final Limit Drive
Transient Enhance
Dialnorm
control drives the look-ahead limiter harder, reduc-
D
IMIT RIVE
control to prevent the look-ahead limiter from caus-
D
IMIT RIVE
preemphasis. As explained above, you
LAT
L D
INAL IMIT RIVE
Table 3-7: Distortion Control Adjustments
L D
INAL IMIT RIVE
INAL
control when using preemphasis.
Range
–6.0 ... +6.00, Off
–6.0 ... +6.00, Off
0.0 ... 10.0
–10.0 ... +12.0
0...10 ms
–31...–11 dB, Global
ORBAN MODEL 1101
control primarily
-
ESS
L drive
IMIT