Klark Teknik DN500 Plus, Operator'S Manual

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Expansion may be used to increase the dynamic range of a signal : of a performance lacking life and vigour, or
of a previously over compressed recording.
Alternatively, expansion can be used to reduce noise, either subtly and undetectably, or with the harder action
of a noise gate.
The unprocessed signal has a fairly narrow dynamic range between the highest and lowest levels. Expansion
makes the lower levels lower still, increasing the dynamic range.
Used as an expander, the DN500 Plus may be connected in the signal chain in exactly the same manner as
when used as a compressor.
Diagram 5
Expansion
Threshold level
Unprocessed signal
2:1 Expansion below threshold
Threshold level
Signal
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Signal
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Time
Time