DSPXmini-FM operational manual V1.2
2
Speed up the average attack time so that the average time constants dominate the control signal providing
slower control.
Decrease the master limiter drive.
Decrease the individual limiter drives.
Final clippers:
Decrease the final clipper drive.
Decrease the clipper hardness control.
Decrease the composite clipper drive.
WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE
MODIFYING 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
BECOME UNSTUCK AND LOSE YOUR WAY ONCE YOU START 'TWEAKING' LOTS OF DIFFERENT
SETTINGS.
More BASS
We can obtain more bass in several ways.
Bass Enhancement:
Increase the peaking filter gain.
Increase the peaking filter Q factor.
Multi-band AGC:
Increase the drive to the AGC band 1.
Speed up the AGC band 1 release.
Lower the AGC band 1 gate threshold, allowing more gain to be applied to low level bass waveforms.
Consider 'force gating' the AGC band 1 so the multi-band AGC for band 1 is bypassed.
Multi-band Limiters:
Increase the band 1 and band 2 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 of those bands
Slow down the band 1 and band 2 average attack time so that the peak time constant dominates the control
signal providing faster control.
Bass clipper:
Increase the bass clip level.
WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE
MODIFYING 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
BECOME UNSTUCK AND 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 'DRIVE' and ‘PEAK ATTACK’ controls
governs the amount of high frequency distortion controlled clipping that is performed.
Multi-band AGC:
Increase the drive to the AGC band .
Speed up the AGC band release time, making it faster.
Lower the band gate threshold, allowing more gain to be applied to low level HF waveforms.
Consider 'force gating' the AGC band 1 so the multi-band AGC for band 1 is bypassed.
Multi-band Limiters:
Increase the band limiter drive.
Slow down the peak attack time for band , letting more through to the clippers.
Speed up the release time of the average release time constant of those bands
Slow down the band average attack time so that the peak time constant dominates the control signal pro-
viding faster control.
