Processing Parameters
21
The
'MULTI-BAND LIMITERS'
peak limit each of the bands to prevent distortion in the processors clipping
peak control system.
'B1-4'
'DRIVE'
Controls the drive into the limiter. The drive can be increased or decreased by up to 12dB.
'THRESHOLD'
Sets the limiter threshold. If audio is below threshold, there will be no gain reduction.
Audio signals that go above will be attenuated. Threshold level can be varied between -6dB to +6dB
in 0.5dB steps.
'PEAK ATTACK'
Controls the attack rate of the limiter, the time the limiter takes to respond to an
increase of input level. The attack time can be varied between 1 and 10 which corresponds to 1mS to
200mS on a semi-exponential scale.
'PEAK DECAY'
Controls the peak release/decay rate of the limiter, the time the limiter takes to
respond to a decrease of input level. The DECAY time can be varied between 1 and 10 which corre-
sponds to 10mS to 1000mS on a semi-exponential scale.
'AVG ATTACK'
Controls the average attack rate of the limiter. This control is a modifier control that
scales from the peak attack control. The attack time can be varied between 1 and 10 which corre-
spond to peak attack time / 2 to peak attack time / 1000 on a semi-exponential scale. The AVG attack
control determines the dynamics of the dual time constant system and how control is shared between
the peak and average circuits.
'AVG DECAY'
Controls the average release/decay rate of the limiter, the time the limiter takes to
respond to a decrease of input level. The DECAY time can be varied between 1 and 10 which corre-
sponds to 200mS to 5000mS on a semi-exponential scale.
'HOLD THRESHOLD'
The HOLD function prevents 'suck-up' of noise and helps reduce IM distortion
by allowing the limiter to rest during periods of silence or low level audio. The level can be adjusted to
turn on when the input drops to a level from -20dB to -40dB. The HOLD can also be switched off.
'DELAY'
This function provides a delay before the peak decay circuit is activated. This can be used
to reduce distortion when faster release time constants are employed by reducing the gain hunting
between neighbouring transients. The range available is 1mS-500mS on a semi-exponential scale.
'HF CLIPPING (BAND 4)'
Redistributes band 4 gain control from the band 4 multi-band limiter to the
HF clipper (FM path) and look-ahead limiter (DR path). Higher numbers are more HF clipping.
'B1<2 COUPLING
' This coupling control determines the percentage of B2’s gain control path that is fed
to B1’s gain control path.
'B2>3 COUPLING
' This coupling control determines the percentage of B2’s gain control path that is fed
to B3’s gain control path.
'B2<3 COUPLING
' This coupling control determines the percentage of B3’s gain control path that is fed
to B2’s gain control path.
'B3>4 COUPLING
' This coupling control determines the percentage of B3’s gain control path that is fed
to B4’s gain control path.
The band coupling controls can restrict the ability of the bands to wander excessively, destroying the
original spectral balance of the input program material. Lower couplings allow more re-equalisation to be
performed for a more consistent tonal balance. 30% is a good compromise.
'L/R COUPLING
' This coupling control determines the percentage that the left and right channels are
linked. 0% is completely uncoupled and equates to a dual mono processing architecture. 100% coupling
ensures the stereo balance of the input program material is maintained. Less coupling can widen the
stereo image for a ‘FAT’ sound.
'LIMITERS RATIO
' Sets the ratio control for all limiters. Selectable between inf:1 (default) and 10:1.
Lower limiters ratio means a bit smoother level control, but also more transients will be passed to clipper,
especially when there's a lot of gain reduction.
