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Operation Dateq DNA-Dymand Manual
8
EXPANDER
The Dymand is primarily a compressor, but it also has an extra function; a downward-expander. The
effect of expansion is the reverse of the effect of compression, it increases dynamics. The
downward-expander in the Dymand works with an adjustable thresholdlevel and a fixed ratio. The
basic function of this expander is to attenuate the signal below the thresholdlevel. This is done with a
fixed ratio of 1:1.25. In effect this means that when the signal is 20dB below the expander
thresholdlevel, the outputsignal will be attenuated by 5dB (1:1.25 means -20dB at the input is -25dB
at the output). The thresholdlevel of the downward-expander is relative to the thresholdlevel of the
compressor. When both, expander and compressor threshold, are -20dB, the absolute expander
thresholdlevel will be -40dB. The downward-expander uses the same detectionsignal and envelope
as the compressor.
Practical use of the expander could be
attenuation of background noise or crosstalk. Experiment with the threshold control, ensure the
expander gain-reduction does not exceed the compressor gainreduction, and the transition from
expansion to compression will be almost inaudible.
KEY-IN & SIDECHAIN
The ways of choosing the detectionsignal have already been discussed. Special detectionsignals are
the keysignal and sidechainsignal. Both signals can be used for special effects or personal
preferences in compression or expansion.
KEY-IN: This input can be activated with the key-switch. By activating the key-input, the process is
dependent on the signal present at the key-input. Compression and/or expansion will be related to
the key-signal. This feature can be used for ducking. Ducking is a processs where the main signal
(signal present at the input) is attenuated by the presence of the key-signal. This is used in situations
where, for example, a voice-over is mixed with music. The voice-over should override the music. To
achieve this, connect the music to the inputs and outputs, and a tap of the voice-over to the key-
input. Adjust the compressor so that gain-reduction will occur when the voice is present.
SIDECHAIN: The sidechain feature can be used to connect a signalprocessing device in the
detection-circuit, for example an equaliser. The selected detection-source (input, key or output) is
present at the sidechain output, while the sidechain input can be switched to the detectioncircuit by
means of the chain-switch. This is useful for frequency-conscious processing like de-essing. De-
essing (attenuation of disturbing 's'-sounds in for example voices) can be done by creating a boost of
the 's'-sound at the sidechain. To do this, connect an equaliser to the sidechain input and output,
activate the 'detection-monitor' and boost the 's'-sound with the equaliser. After setting the equaliser,
switch back to normal operation. The 's'-sound is noticeably less disturbing than before.
INPUT (dB) -10 0 +10
OUTPUT (dB)
-10
0
+10
Threshold level