Drawmer DL231 Spécifications télécharger pdf (Page 9)

DL231 OPERATORS MANUAL

Using the Expander alone

Disable the compressor by turning either the threshold or ratio anti-clockwise. Adjust the

expander as described above but use compressor release control to adjust release time.

An in-built ‘hold’ facility stabilises the expander against momentary gain reduction during

short duration decreases in the signal level.

Frequency Conscious Expansion

This is used when unwanted noise at different frequencies to that being processed

requires removal without effecting the required signal. For example, some guitar

flangers, treble boosters and amplifiers emit noise at higher frequency than that being

processed. Set the external equalisation by switching to ‘S/C listen’ and adjust to cut the

offending frequencies. The expander will then only operate on the required signal (the

spill from a nearby bass drum or bass guitar can be filtered in the same way). Switch to

‘norm’ and adjust the expander to obtain the required noise reduction.

NB The external filter will not affect the processed signal, only the control circuitry.

Frequency Conscious Compression

This can be achieved by applying EQ to the compressor side-chain access at the rear of

the unit. Once again, a ‘side chain listen’ facility is provided to assist this operation. Set

the equalisation so as to boost the offending frequencies. Switching to ‘norm and

adjusting the compressor as necessary will result in the offending frequencies being

attenuated, but only when they exceed the threshold level. This method allows

broadband HF boost above 2 kHz to be applied to the signal before compression thus

obtaining a crisp, sharp sound. The sibilants thus created can be controlled without

affecting the basic tonal structure by boosting the side chain EQ at 7 to 10 KHz by 10 dB

or so. By the same token, ‘popping’ caused by LF boost can be controlled by applying

boost to the side chain at frequencies below 100 Hz. For best results, a parametric or

graphic equaliser should be employed because offending frequencies often occupy

narrow bands.

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Drawmer DL231 Spécifications Page 9