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Instrument Familiarisation: Front Panel Controls
The DN500 Plus Dual Compressor/Limiter/Expander consists of two identical channels, each with separate
Compressor, Expander and Limiter sections.
1. determines the level above which gain reduction (compression) will take place, variable
from +20dBu down to -30dBu. The Gain Reduction light bar graph meter indicates in decibels by how
much the signal is compressed at any instant.
2. sets the degree of compression applied above the threshold level, variable from 1:1 to 50:1. A
ratio of 1:1 corresponds to zero compression : Signal In = Signal Out. A ratio of 10:1 indicates that
when the input signal, above the threshold, rises in level by 10dB, the output level will rise 1dB.
3. calibrated from 1 to 40, adjusts the 'hardness' or 'softness' of the compression effect. Ahard knee
means that when the input signal level rises above the threshold, it is immediately compressed at the
full ratio as set. A soft knee means that compression will start below the threshold level at a low ratio
and gradually attain the full ratio selected only at higher levels.
4. sets the time taken for compression to commence after the threshold is exceeded, from 0.05
milliseconds (50 microseconds) to 20 milliseconds.
5. determines the time taken for the gain to return to normal after the signal drops below the
threshold level, adjustable from 60 milliseconds to 2 seconds.
6. The switch selects the whole channel to be in or out of circuit.
7. links the two channels of the DN500 Plus together, so that they are both operated from the
controls of Channel A, apart from the Limiter sections which always work individually. In stereo
mode, the unit still monitors the levels of both channels to detect when the signal is above the threshold
level (on Channel B, the Stereo switch is replaced by a 'Stereo Slave' light indicator).
8. selects the compression effect to be in or out.
9. allows the setting of attack and release times to be automatic or manual. On Auto, the attack
time of the input signal and the amount by which it exceeds the threshold level are assessed, and
suitable Compressor attack and release values set to give an almost undetectable
reduction in signal dynamic range. On Manual, the rotary Attack and Release controls come into
operation.
Compressor
Threshold
Ratio
Knee
Attack
Release
Bypass
Stereo
Comp In
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