Cedar DNS3000, Manual, Page: 15 / 44

CEDAR DNS3000 dialogue noise suppressor
11
If you select Low alone and cannot suppress the noise, it is probable that there is considerable
noise energy in the Mid band, so you should return to using Low+Mid ranges.
For many problems such as traffic noise, the noise will lie primarily in the range 50Hz - 1.5kHz.
In this case, Low+Mid will be the correct choice.
Second, optimise the Level control.
Listening carefully to the audio, refine the Level setting so that the noise is correctly identified
without introducing audible artefacts. If this proves difficult, you can return the Band Gain
controls to -24dB for this stage.
The DNS3000 takes a short period to ‘settle’ after moving the Level control (especially in the
lower ranges) so you should not adjust it rapidly.
Third, refine the Band Gain controls for optimum suppression.
Set all six Band Gain controls to 0dB. Now increase and decrease the gain in each band
separately while listening to the effect that each has on the noise. This will identify the bands
that contain the majority of the noise. (Do not be alarmed if all six bands contain significant
noise. This is not unusual.)
Let’s assume that the greatest improvement occurs when you reduce the gain in bands 3 and 4.
This suggests that the noise is concentrated in an approximate range of 200Hz to 1kHz. You
should now find the optimum positions for all six faders. The greatest cuts will lie in bands 3 and
4, whereas bands 1, 2, 5 and 6 should remain as close to 0dB as possible to ensure that
minimal signal damage occurs in the bands that do not contain much noise.
The final configuration may look like this: