Klark Teknik DN500 manual Expansion Settingthecontrols

Expansion:Settingthecontrols￿￿￿￿

Threshold sets the level below which expansion takes place. Signals above the threshold will remain unaltered. Turning the control anticlockwise raises the threshold level and allows more of the signal to be expanded. A low threshold would be used to reduce noise, a higher threshold to increase the dynamic range of a signal.

Ratio is the 'strength' of expansion below the threshold level. The higher the ratio, the greater the effect.

At an expansion ratio of 2:1, the effect is mild and suitable for subtle noise reduction or dynamic range enhancement. At higher ratios the effect becomes harder and more like a noise gate. The light bar graph indicates the amount of gain reduction taking place.

Attack sets the time the Expander takes to respond once the signal has passed below the threshold. This can be done automatically, the circuitry continuously analysing the signal to determine optimum attack time. Or it can be set to a fixed value of 2ms.

Release determines the time taken for the gain to return to normal after the signal comes back above the threshold level. For hard gating, this may be set to a short value. Longer release times are suitable for dynamic range enhancement or subtle noise reduction.

Gain is the output level control for the entire channel, Compressor, Expander and Limiter. The output level light bar graph meter indicates output level when the channel is switched in circuit. When the channel is bypassed, the meter indicates INPUT level.

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