3-28
OPERATION
ORBAN MODEL 9300
Clipper Controls
B1-B5 Clip Thresh
controls set the thresholds of four clippers in Orban’s patented
embedded multiband distortion-canceled clipper in units of dB with reference to the
final clipper. These clippers are embedded in the multiband crossover so that any
distortion created by clipping is rolled off by part of the crossover filters. The band
1+2 clipper operates on the sum of bands 1 and 2; these bands are not clipped sepa-
rately.
The threshold of the Band 1+2 clipper is usually set between 2 dB and 6 dB below
the threshold of the final limiter in the processing chain, depending on the setting
of the
L
ESS
-M
ORE
control in the parent preset on which you are basing your Modify
adjustments. This provides headroom for contributions from the other three bands
so that bass transients don’t smash against the back-end clipping system, causing
overt intermodulation distortion between the bass and higher frequency program
material.
Some 9300 users feel that the band 1+2 clipper unnecessarily reduces bass punch at
its factory settings. As you raise the threshold of the clipper, you will get more bass
but also more distortion and pumping. Be careful when setting this control; do not
adjust it casually. Listen to program material with heavy bass combined with spec-
trally sparse midrange material (like a singer accompanied by a bass guitar) and lis-
ten for IM distortion induced by the bass’ pushing the midrange into the clipping
system. In general, unless you have a very good reason to set the control elsewhere,
we recommend leaving it at the factory settings, which were determined following
extensive listening tests with many types of critical program material.
This advice also holds for the thresholds of the other band clippers. These clippers
prevent audible distortion in the final clipper and their settings are very critical.
MB CLIP
(“Multiband Clipper”) control adjusts signal level going into the multi-
band clippers and therefore determines the amount of peak limiting done by clip-
ping. Range is –4dB to +5dB.
This control and the
F
INAL
C
LIP
D
RIVE
control govern the trade-off between loudness
and distortion. Note that these ranges are relative, and do not indicate the exact
Clipper Controls
Full Control Name
Advanced Name
Range
FINAL CLIP
Final Clip Drive
0 … +5.0 dB
MB CLIP
Multiband Clipping
–4.0 … +5.0
---
B1+B2 Clip Threshold
–16.00 … –1.25 dB, Off
---
Band 3 Clip Threshold
–16.00 … –1.25 dB, Off
---
Band 4 Clip Threshold
–16.00 … –1.25 dB, Off
---
Band 5 Clip Threshold
–16.00 … –1.25 dB, Off
---
High Frequency Clipping
0 … 6
Table 3-4: Clipper Controls
Содержание OPTIMOD-AM 9300
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