Try Demo of this plugins:
http://minimalsystem.com/...h=59&product_id=66 Btw to ansver your question: Sonitus Eq transparent to minor dull sounding.
Many plugins if you listen very carefully, you can hear a change in the eq just a tiny bit, by inserting it into a track.
For me i listen very carefully, when i insert an Dynamic processor / Effect.
A little dull here and a little dull there ,will certainly affect overall sound to more dull !
Also when inserting an effect, listen to how it affect the side signal too, the wideness of your track.
With training you will notice this.
Listen, listen,listen............ it is like learning compression, how it affect your sound, and it takes time.
for surgical non coloring editing, you could use this EQ:
http://www.fabfilter.com/...ro-q-equalizer-plug-in