This article got me thinking about EQ comparisons that I have done in the past. In particular, I auditioned the Sonnox EQ a year or two ago at the time that I bought the Sonnox Reverb. I ended up not buying the EQ. I liked it a lot, but I liked the stock PT EQ plugs just about as well, so I couldn't see paying for a small upgrade. I've heard so many people rave about the Sonnox that I wonder if I gave it a fair shake. Of course, this might be a matter of people looking to squeeze the last little bit of improvement. Or it could be that their ears are better than mine. But the fact remains that I didn't really test the Sonnox EQ in any systematic way. So...if you were trying to make a systematic evaluation of EQ how do you do it? What do you use for sources? Do you try to compare very subtle treatments? Exaggerated treatments? How do you try to make them "equal?"