Compression is partly achieved by increasing the level of low level signals. The lower the input signal level, the higher the additional gain applied to that input signal by the compressor. As the level of the input signal rises, the amount of gain applied is reduced. Please see the figure to the right.
Dynamic structures of the entire range of the input signal amplitude are converted proportionally. Even after compression the dynamics of incoming audio are maintained, only slightly condensed, leaving a transparent, seemingly uncompressed sound impression.
The gain of the compressor (called ‘range’) can be limited from 1 dB to 15dB to prevent unacceptable increase in backgrounds during signal pauses (e.g. ambience).
To help eliminate unwanted very low level noise (air-conditioning, hum, and noise), a Jünger Expander can be used. Below an adjustable threshold level, the expander will attenuate the level of the incoming signal: as the incoming signal drops so low that it is ‘in the noise‘ the Expander reduces the signal level further to ‘hide‘ the noise.
The Range parameter sets the maximum attenuation applied when the incoming signal level is within 6dB below the Threshold level.