Drawmer DL231 Dual Expander/Compressor - Manual (Page 8)

DL231 OPERATORS MANUAL 6
OPERATION
Having connected signal inputs and outputs as required, set the unit as follows-
Threshold, Ratio, Attack, Release - Anti clockwise
Output Gain - 0 dB
Display Switch - VU
Output Switch - Bypass
Peak Limit - Off
Stereo Link - Off
Display - VU
Expander - Off
1. Adjust input signal level on preceding equipment to show 0 dB on display, peaking
to +2.
2. Change output switch to ‘norm’ and display switch to GR. Adjust Threshold, Ratio,
Attack and Release to give the required compression characteristics and read the
gain reduction on the display.
3. Change output switch to VU and adjust output gain for optimum reading on the
display.
4. If the Peak Limiter is required, adjust output gain so that the limiter operates on
signal peaks only. It is important to remember that the peak limiter is connected
after the output gain control so care should be taken to avoid ‘pushing’ the gain
controls for more level, particularly when treating stereo signals.
5. For stereo operation, switch in the stereo link and set up as above, making sure
that all controls are the same for both channels. GR. displays will show the same
readings, except when excessive peak limiting occurs on either channel.
6. If ambient noise is ‘pumped’ up to an unacceptable degree during compression,
change expander switch to ‘norm’ and adjust the expander threshold so that the
noise is removed. The expander threshold should be set below the compressor
threshold level to avoid interaction.
7. Set ratio and attenuation to suit the particular application. When used on a final
mix, set threshold as low as possible but above unwanted noise. Ratio should be
1:2 and attenuation at 10 to 20 dB. This will provide a gentle expansion which will
minimise drop out effects during a fade. However, drums would be better with a
1:5 or 1:20 ratio and 20 or 40 dB attenuation using a higher threshold level. For
vocals, set threshold so as to remove breath and headphone noise and set ratio
a 1:2 or 1:5 with attenuation of 20 or 40 dB.
In all cases, attack is automatic and release is controlled by the compressor.
These suggestions are for guidance only. The final adjustments should be made
to suit the particular application and conditions.