Hello I'm mainly interested in Nebula for mastering purpose and just made a few test with "Nebula3 free".
I have tested the 2 following eq : 239-state of logic MD S 242-Vintage EQ I
The 239 didn't pleased me too much and I prefered the 242-vintage EQ-I for it's smooth response and good stereo imaging. I made comparisons with 2 of my usual EQ (sonalksis SVC517 and Electriq from Aixcoustic) and found that the Nebula program was reducing the dynamic in a very noticeable way.
A this point, I'm still interested in Nebula but wonder if other Nebula EQ programs behave the same way. In that case, I wouldn't find Nebula useful for EQ mastering.
So please if you are familiar with mastering (professional or at least advanced operator) let me know what you think about this dynamic subject. (in a mastering context let me insist !!!)
It's quite difficult to judge Nebula on such a limited number of programs but in the other hand, I should have expected the developper to include at least one of their best EQ program in the demo/free version. Not to say the 242vintage EQ is bad...for mixing purpose it would be a fine tool.....
As you might notice, there are demo presets from 3.rd party developers that can be used with neb. free. None of them has demo periods but I can't remember which has reduced quality, but some don't.
The ones in free library were life savers years ago when ITB coloration was such a limited world. Today for me they represent steps of evolving technology.
Finally, remember these eq's are sampled (for every setting). So chaining 2 full bands is like using 2 hardwares for each band in analog world. Naturally, even in analog world this can reduce dynamic range (which can also mean Nebula is THAT good for what it does).
Most (probably all) 3.rd party librarys has clean versions and you can chain them after full color presets. Also there is no problem to use a min.-phase eq (like sonalksis) after a Nebula "preset".
Forget Nebula free. Get a paid version and try the free full quality demo programs from CDS. Cooltec, Siemens W295b, Mastering suite, Nice EQ and GEQ8300 are a huge step up from the Nebula free library.