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Applications

In this chapter the use of the compressor and expander process, key and side-chain and stereo-link

will be explained.

COMPRESSOR

Compression is used to reduce dynamics to make a more acceptable or comfortable range of sound

level, and to increase loudness or create impact.

The compressor is primarily a linear audio-amplifier with a voltage controlled attenuating element, in

this case a VCA (voltage controlled amplifier). The control voltage is derived from what is called the

detection-circuit. The characteristics of this detection circuit determine the performance of the

compressor. This is also the heart of the Dymand. Most compressors create a lot of side-effects such

as pumping and dullness. We have, as far as possible, eliminated these side-effects in our detection

circuit.

Dullness of heavily compressed material is caused by over-compression of transients, while pumping

and breathing are effects caused by envelope and frequency-sensitivity.

The sensitivity of compression is determined by the thresholdlevel (the point at which gain reduction

commences), the ratiosetting (the relationship of inputlevel to outputlevel), the attacktime (speed of

operation) and the releasetime (speed of recovery).

THRESHOLD: The thresholdlevel determines the level at which the compressor will start to work.

Below this level the relationship between inputlevel and outputlevel is 1:1, above this level the slope

is determined by the ratio setting. The threshold control on the Dymand is adjustable from -20 dB to

+20 dB.

RATIO: Ratio or slope is the relationship between the inputlevel and outputlevel of a device. Normal

amplifiers (such as mixing consoles) have a ratio of 1:1. A ratio of 1:3 means that 3 dB at the input

will be 1 dB at the output. Ratios up to 1:5 are called compressionslopes, ratios as high as 1:20 are

called limit-slopes. The Dymand is adjustable from 1:1,5 to 1:20.

Operation

OUTPUT (dB)

+10

-10

Different ratio settings

Dateq DNA-Dymand Manual

1:1

1:2

1:20

Threshold level

+10

INPUT (dB)