3-54
OPERATION
ORBAN MODEL 8300
controls, which have never previously been available in an Orban processor, are risky
and difficult to adjust appropriately. They affect the sound of the processor in many
subtle ways. The main trade-off is “punch” (achieved with slower attack times) ver-
sus distortion and/or pumping produced in the clipping system (because slower at-
tack times increase overshoots that must be eliminated in the clipping system). The
results are strongly program-dependent, and must be verified with listening tests to
a wide variety of program material.
The
A
TTACK
time controls are calibrated in arbitrary units. Higher numbers corre-
spond to slower attacks.
The look-ahead delay time in bands 3, 4, and 5 automatically tracks the setting of
the
A
TTACK
time controls to minimize overshoot for any attack time setting.
MB Limit Speech Threshold
.
See page 3-44.
Maximum Distortion Control
limits the maximum amount of final clipper drive
reduction (in dB) that the 8300’s clipping distortion controller can apply, preventing
over-control of transient material by the distortion controller. Instead, the final clip-
per is permitted to control some of the transient material (to increase “punch”),
even though, technically, such clipping introduces “distortion.” A setting of 4 to 5
dB works best in most cases. Factory default is 5 dB for virtually all presets.
High Frequency Limiter
sets the amount of additional gain reduction occurring in
band 5 when high frequency energy would otherwise cause excessive distortion in
the final clipper. It uses an analysis of the activity in the final clipper to make this de-
termination, and works in close cooperation with the band-5 multiband clipper.
Functionally, this control is a mix control that adds a HF limiter gain reduction signal
to the band 4 gain reduction signal to determine the total gain reduction in band 5.
Higher settings produce more HF limiting. A setting of “–18” provides a good trade-
off between brightness and distortion at high frequencies.
Limiter Attack
controls allow you to set the limiter attack anywhere from 0 to
100% of normal in the Five-Band compressor / limiters. Because the limiter and com-
pressor characteristics interact, you will usually get best audible results when you set
these controls in the range of 70% to 100%. Below 70%, you will usually hear
pumping because the compressor function is trying to create some of the gain re-
duction that the faster limiting function would have otherwise achieved. If you hear
pumping in a band and you still wish to adjust the limiter attack to a low setting,
you can sometimes ameliorate or eliminate the pumping by slowing down the com-
pressor attack time in that band.
Delta Release
controls are differential controls. They allow you to vary the release
time in any band of the Five-Band compressor / limiter by setting an offset between
the
M
ULTIBAND
R
ELEASE
setting and the actual release time you achieve in a given
band. For example, if you set the
M
ULTIBAND
R
ELEASE
control to medium-fast and the
B
AND
3
D
ELTA
GR
control to –2, then the band 3 release time will be the same as if
you had set the
M
ULTIBAND
R
ELEASE
control to medium and set the
B
AND
3
D
ELTA
GR
control to 0. Thus, your settings automatically track any changes you make in the
M
ULTIBAND
R
ELEASE
control. In our example, the release time in band 3 will always be
two “click stops” slower than the setting of the
M
ULTIBAND
R
ELEASE
control.
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
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Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...
