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HELIX DN9848E Remote Control Software
User Guide
51
5.3.7 Compression (Dyn. Screen)
Each output has an independent full range compressor to improve the audio dynamics and/or reduce
louder signal levels to avoid loudspeaker damage. The compressors are variable ratio and can be set to
a hard knee characteristic for a sharp gain reduction response at the compression threshold, or soft
knee for a more ‘musical’ response.
To set the compressor parameters
1 In the Compressor section of the Dyn. screen, adjust the Threshold control knob to give a
threshold value in the range –10.0 dBu to +21.0 dBu.
2 Adjust the Ratio control knob to give a ratio from 1:1 to 5:1.
3 Press the Soft button to select soft or hard knee, as required, where (button
illuminated) shows soft knee is selected and
(button extinguished) shows hard knee
is selected.
4 Press the In button to select bypass state, where (button illuminated) shows
compressor included in signal path and
(button extinguished) shows compressor
excluded form signal path. The relative position of the compressor threshold to the limiter
threshold will be indicated by an illuminated segment at the meter (see Dyn. screen
above), provided the compressor threshold is below the limiter threshold.
5 Adjust the Attack control knob to set the compressor attack time in the range 40 µs to
100 ms.
6 Adjust the Release control knob to set the release time between 10 ms and 2000 ms.
Meter: illuminated
segment shows the
compressor position
relative to the limiter
threshold