Reducing Background Noise On Records

Once you have tried all the passive adjustments, tweaks, mats, VTA fine tuning, etc., if you still want to reduce noise, you can start with filters and signal processors like you have done, but they will affect the sound in ways you might not want, even as they reduce noise.

If you are referring to the noise like clicks and pops, I can recommend the Sweetvinyl Sugarcube.  I am a beta tester for the SC-2 ($3000 list), and it removes abouit 95% of the clicks and pops without altering the underlying signal in any way that I can hear.  The SC-1 ($2000 list) will do this as well.  However, you should know that removing the clicks and pops makes the record's surface noise (the steady state/rythmic hiss or groove noise) more apparent than without the click and pop filtering.  Overall, I still vastly prefer the results of the click and pop filtering, but I was surprised by how much more detail and surface noise are revealed once the clicks and pops are gone.

Sweetvinyl has hinted that they are working on additional processing that will reduce surface noise, but this is a complicated algorythm, and may be available in the future, but not free of charge, as a downloadable software upgrade.  I think that means it may only be available as an upgrade on the SC-2, since I am not sure the SC-1 has software that can be upgraded via the web.