Klark Teknik HELIX DN9848E, Operator'S Manual

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Output Channels
17
6.2.7 Compression (Page 13)
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
On the first compressor menu page, use the centre
DATA
ENTRY
control knob to select a threshold value in the range
–10dBu to +21dBu, and the right control knob to set a
ratio from 1:1 to 5:1.
2
Turn the left control knob clockwise to access the first sub-
menu page. Use the centre control knob to select a hard
or soft knee characteristic and the right control knob to set
the bypass state to “No” so that the compressor is
included in the signal path. The relative position of the
compressor threshold to the limiter threshold will be
indicated by an illuminated segment at the meter
(provided the compressor threshold is below the limiter threshold).
3
Turn the left control knob clockwise to access the second sub-menu page. Use the centre
control knob to set the compressor attack time (range of 40 µ s – 1ms in 20 µ s steps or 1ms to
100ms in 1ms steps). Use the right control knob to set the release time (10ms to 2s in 10ms
steps).
To switch the compressor out of the circuit
Set the bypass state on the second page to “Yes”. The other settings will be retained for
future use.
6.2.8 Output Limiter (Page 14)
In addition to compression, each DN9848E output has a
limiter to protect any attached equipment being driven
into clip and potentially being damaged. Notably, the
DN9848E uses a special ‘look-ahead’ limiter so that it can
anticipate transient overshoots and act ‘immediately’ (see
Section 10 “Application Notes” for further details). The limiter threshold can be adjusted to
accommodate the varying requirements of commercial equipment.
To set the limiter parameters
1
Select a threshold value in the range –10dBu to +21dBu with the left
DATA ENTRY
control knob.
2
Use the centre control knob to set a release time between 1ms and 100ms.
3
Use the right control knob to select a hard or soft knee characteristic for a sharp or gradual
cut-off, respectively.
To switch the limiter out of the circuit
Turn the left
DATA ENTRY
control knob fully clockwise until the threshold value reads ‘OFF’ (a
sharp turn will leap to the OFF position).
Illuminated
segment shows the
compressor position
relative to the
limiter threshold