3-66
OPERATION
The range of the band mix controls has been purposely limited because
the only gain control element after these controls is the back-end clip-
ping system (including the multiband clipper / distortion controller),
which can produce considerable audible distortion if overdriven. The
thresholds of the individual compressors have been carefully tuned to
prevent audible distortion with almost any program material. Large
changes in the frequency balance of the compressor outputs will change
this tuning, leaving the 8600 more vulnerable to unexpected audible dis-
tortion with certain program material. Therefore, you should make large
changes in EQ with the bass and parametric equalizers and the HF en-
hancer, because these are located
before
the compressors. The compres-
sors will therefore protect the system from unusual overloads caused the
chosen equalization. Use the multiband mix controls only for fine-tuning.
You can also get a similar effect by adjusting the compression threshold
of the individual bands. This is comparably risky with reference to clipper
overload, but unlike the
MB
B
AND
M
IX
controls, does not affect the fre-
quency response when a given band is below threshold and is thus pro-
ducing no gain reduction.
On/Mute
switches allow you to listen to any band (or any combination of bands) in-
dependently. This is a feature designed for intermediate or advanced users and de-
velopers when they are creating new 8600 presets. The mute control for a given
band affects
both the FM and HD processing
because it mutes the input of compres-
sor in that band. This prevents the muted compressor’s sidechain from producing a
gain reduction signal that could couple into unmuted bands through the various
band-coupling controls.
Please note that a single band will interact with the back-end clipping system quite
differently than will that band when combined with all of the other bands. There-
fore, do not assume that you can tune each band independently and have it sound
the same when the clipping system is processing all bands simultaneously.
Advanced Multiband and Band Mix Controls
The following Multiband and Band Mix controls are found only in the Advanced
Modify screen.
Compression Threshold; Speech Compression Threshold
controls set the com-
pression threshold for music and speech in each band (following the 8600’s automat-
ic speech/music discriminator), in units of dB below the final clipper threshold. We
recommend making small changes around the factory settings to avoid changing the
range over which the
MB
C
LIPPING
control operates. These controls will affect the
spectral balance of the processing above threshold, but are also risky because they
can significantly affect the amount of distortion produced by the back-end clipping
system.
You can use these controls to set independent frequency balances for music and
speech (page 3-70).
B1-B5 Attack (Time); Speech B1-B5 Attack
controls set the speed with which the
gain reduction in each band responds to level changes at the input to a given band’s
compressor for music and speech respectively, following the 8600’s automatic
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