Klark Teknik U.S.A. Air Compressor DN540 Manual Do Utilizador
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.
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.
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.
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.
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 (
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.