KDFX Reference
KDFX Algorithm Specifications
10-211
expander may be used to suppress background noise in the absence of signal, thus typical expander
settings use a fast attack (to avoid losing real signal), slow release (to gradually fade out the noise), and the
threshold set just above the noise level. You can set just how far to drop the noise with the expansion ratio.
Figure 10-111 Expansion Transfer Characteristic
The signal being compressed/expanded may be delayed relative to the side chain processing. The delay
allows the signal to start being compressed (or stop being expanded) just before an attack transient arrives.
Since the side chain processing “knows” what the input signal is going to be before the main signal path
does, it can tame down an attack transient by compressing the attack before it actually happens (or
releasing the expander before the attack happens). This feature works whether the side chain is configured
for feed-forward or feedback.
A meter is provided to display the amount of gain reduction that is applied to the signal as a result of
compression and expansion.
The algorithm Comp/Exp + EQ differs from Compress/Expand in that the compressor and expander
sections are followed by equalization filters. The output signal may be filtered with bass and treble
shelving filters and a mid-range parameteric filter.
Parameters
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In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
FdbkComprs In or Out
Comp Atk 0.0 to 228.0 ms Exp Atk 0.0 to 228.0 ms
Comp Rel 0 to 3000 ms Exp Rel 0 to 3000 ms
SmoothTime 0.0 to 228.0 ms
Signal Dly 0.0 to 25.0 ms
Comp1Ratio 1.0:1 to 100.0:1, Inf:1 Exp Ratio 1:1.0 to 1:17.0
Comp1Thres -79.0 to 0.0 dB Exp Thres -79.0 to 0.0 dB
Comp2Ratio 1.0:1 to 100.0:1, Inf:1 MakeUpGain Off, -79.0 to 24.0 dB
Comp2Thres -79.0 to 0.0 dB
Out
Amp
In Amp
Threshold
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