My opinion on Flux ePure vs oZone EQ in LP mode:
I found the Flux ePure to sound
nearly identical to the oZone EQ in LP mode. Both kinda dry up and "cardboardize" the sound if you do too much. I really like the high-Q/high-gain settings on the Flux for creating subtle resonant peak effects. OZone doesn't seem to like boosting unless its in the 3khz range or the more boomy side of the 200hz area. The low rolloff on oZone is really good, the high, not so much... you can hear the crossover point too distinctly it seems. High shelf on ePure is NICE! Really preserves the time coherenchy and definitely adds a little candy whether you boost or cut (even though its not supposed to). Don't like the highpass or lowpass simply because they are not adjustable in bandwidth, they do seem to do their job, but the curves are a little steep for most of the material I tried. They sound really good for how steep they are I suppose, with no bump above the x-over. Both have their place, however limited it may be. Both tend to shine in different areas of cleaning up lower quality source material without damaging the good parts. Both are great in situations when EQ is used to touch up any artefacts from a previous bout of processing, etc.
Using digital EQ, generally it seems best to use just enough to fix the problem, but not enough to be noticeable. I like to "underprocess," because in the end I find that it is clarity and a certain precise focus (or purposeful un-focus) on the pleasant sounding aspects of the source that makes things sound loud and punchy on a GOOD playback system. Generally I find mastering to have a lot in common with restoring an antique of some sort. If it ain't broke don't fix it. If it is, make sure you don't break anything else when you fix it. In the end, you didn't design the source material, so there really is no miracle. Some things are simply unrepairable and/or undisplayable to anyone but the artist...though they will never let you tell them that. Just smile, turn knobs, accept payment, and forget to put your name on it. I've definitely made the mistake of putting my name on crap before... the artist will go around telling everyone how much you suck when its really them that sucks. Then you have to go on a campaign, bashing them because they got everyone thinking you suck and you have to prove that it's really them that sucks...
all because you put your name on something that you knew sucked to begin with. What, did you think someone would actually take the blame for something that was clearly and painfully obviously their fault? Of course not.
PS: I just had to keep typing until this post turned into a rant. It took a lot longer this time than my last post. I'm getting better doctor, I swear...