FBT QUBE SP27 - Manual (Page 32)

The SP27 “D-Max” limiter predelays the sidechain signal, resulting in a “zero overshoot” limiter, which is able
to catch all peaks and provide a reliable absolute maximum setting for the output of any channel.
The predelayed sidechain is shown in green, with
the main signal in red. As the main signal arrives
slightly after the sidechain, the output from the unit
does not suffer from the overshoot problem.
Remember that this delay is only in the order of
tens of uS,and is a
– the sidechain is
moved in time in relation to the main signal.
Inserting a delay into the signal path of an
analogue dynamics processor will achieve similar
results, but with the penalty of delaying the main
signal by the amount of look ahead delay
introduced.
predelay
back
main
The “D-Max” limiter which appears in output lists just following the traditional limiter, has only two parameters
to adjust:
The release time (either Fast, Medium, or Slow) and the threshold. Note that the threshold is set to be a
minimum of 2dB above the threshold of the program limiter – setting the threshold to 10dB Above, as in the
example, means that no more than 10dB of overshoot above the threshold of the program limiter will ever be
allowed.
The release time may also be set to follow the High Pass filter of the output – this is achieved through the
sub-menu, and will result in the display changing to show
OP1 Output 1 ClipLim
Rel.= Medium 10dB Above
OP1 Output 1 ClipLim
Rel.= Auto 10dB Above
Designa
Crossover
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