Getting The Sound You Want
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Slow down the peak attack time for band 1, letting more through to the clippers.
Speed up the release time of the average release time constant.
Slow down the band 1 average attack time so that the peak time constant dominates the control signal pro-
viding faster control.
Decrease the band 1 HOLD level or turn it off.
Decrease the band 1 Delay time
Increase the band 1 limiter threshold, letting more through to the clippers.
Reduce the B1<2 coupling control so that band 1 has independent level control and is not coupled to band 2.
Bass clipper: (FM USE)
Increase the multi-band clipper drive.
Increase the bass clip level.
Look-ahead limiter: (DRUSE)
Increase the look-ahead limiter drive.
Increase the band 1 look-ahead limiter attack time constant slowing down the attack of the secondary time
constant circuit.
Decrease the band 1 look-ahead limiter decay time constant speeding up the decay of the secondary time
constant circuit.
WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE
MODYFYING LOTS OF THE PARAMETERS. IF YOU ARE ADJUSTING ONLY A COUPLE FROM THE
ABOVE SUGGESTIONS THEN YOU PROBABLY HAVE A BIT MORE LEE-WAY. IT IS VERY EASY TO
LOSE YOUR WAY ONCE YOU START 'TWEAKING' LOTS OF DIFFERENT SETTINGS.
More TREBLE (HF)
We can obtain more high frequency energy in several ways. When processing for FM we need to use distortion
controlled clipping to preserve as much of the high frequency content as possible, which will be removed by the
de-emphasis curve in the listeners radios. The ‘HF CLIPPING’, band 4 ‘PEAK ATTACK’ and ‘RATIO’ controls
governs the amount of high frequency control distortion controlled clipping that is performed.
Digital radio users should avoid high HF clipping settings as they put extra workload on the look-ahead limiter.
Dual use (FM and DR) users can compensate for the HF clipping control with the look-ahead shelf control.
Multi-band AGC:
Increase the drives to band 4 AGC.
Slow down the band 4 AGC attack time, letting more through to the limiters.
Speed up the band 4 AGC release time, making it faster.
Lower the band 4 Gate threshold, allowing more gain to be applied to low level HF waveforms.
Speed up the band 4 'return to rest speed' and set the 'return to rest level' to a lower number.
Set the band 4 'ratio' to 2:1 so that the AGC does not over control the HF, allowing the limiter more control.
Consider 'force gating' the band 4 AGC so the multi-band AGC for band 4 is bypassed.
Reduce the B4<3 coupling control so that band 4 has independent level control and is not coupled to band 3.
Multi-band Limiters:
Increase the band 4 limiter drive .
Slow down the peak attack time for band 1, letting more through to the clippers.
Speed up the release time of the average release time constant.
Slow down the band 4 average attack time so that the peak time constant dominates the control signal pro-
viding faster control.
Decrease the band 4 HOLD level or turn it off.
Decrease the band 4 delay time.
Increase the band 4 limiter threshold, letting more through to the clippers.
Reduce the B4<3 coupling control so that band 4 has independent level control and is not coupled to band 3.
Set the HF clipping control to higher numbers which shifts control from the band 4 limiter to the distortion
controlled HF clipper and look-ahead limiter.
HF clipper: (FM USE)
Increase the multi-band clipper drive.
Increase the HF clipper level.
Look-ahead limiter: (DRUSE)
Increase the look-ahead limiter drive.
