View Single Post
Old 20th November 2009
  #6
It is side chain control. If you replace them with precision very low noise opamps, the modulated noise that is reduced on the DC VCA control port lines will allow THD to drop a bit.

I have lowered THD in other higher end dbx products by doing this and replacing the 10 nv noise 4558's with precision LT and AD devices.

Jim Williams
Audio Upgrades