Klark Teknik DN540 User Manual download pdf (Page 36)

Chapter 7: Using The Compressor

DN540

24 Operator Manual

Manual mode with hard knee (linear peak)

With the HARD pushbutton switched on, the

compressor is peak sensing with manually

adjustable linear attack and second order

release envelope characteristics. For limiter

applications, a high ratio combined with fast

attack times are best; set the release slow to

minimise distortion on low frequency

instruments. Lower ratios with slow attack and

relatively fast release provide transparent

compression with some dynamic control, which

does not unduly affect the intentional dynamic

content of the source material. This can be used with difficult instruments like acoustic

guitar to keep equal perceived loudness within a mix, without producing excessive

flutter or distortion.

Auto mode with hard knee (exponential RMS)

With both the AUTO and HARD pushbuttons

switched on, the compressor is RMS sensing

using exponential attack and release. The RMS

averaging process defines the attack and release

times to produce a very adaptive envelope

character. This provides faster attacks on large

(over threshold) signal changes and produces

slower attacks on small signal changes. The lack

of manual time constant settings makes this

mode very fast and simple to set up on most

programme material. It is also sonically

accurate and works well for limiting of vocals and compression of many other sources.

Auto mode with soft knee (exponential RMS)

With the AUTO pushbutton switched on, the

compressor is RMS sensing with an underlying

exponential attack and release characteristic

that is slightly modified by the soft knee

curvature. This produces extremely natural

results, even with higher compression ratios,

and is especially suited for vocals.

Limiter

A limiter is essentially an extreme form of compressor that only affects signals above a

selected threshold level (dB). This is particularly useful for limiting only peaks in the

signal, while leaving the rest of the signal alone. A limiter acts as a last check on signal

level. If the level goes over threshold, fast acting, high ratio compression is applied to

bring it back within bounds.

To set up the DN540 as a limiter, select the compressor to operate in manual and hard

knee mode (see “Manual mode with hard knee (linear peak)” on page 24) with attack

set to fastest (20ms) and the ratio set to infinity to one (

4:1). Adjust release to suit

the programme and set threshold as required.

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Klark Teknik DN540 User Manual Page 36

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