I hear ya, I would take some time too for a little reflection.
I spent some time with the wiim pro eq settings and it's a blast, but it comes with a price. More on that later.
The wiim pro is connected to the coaxial input of the A6000 ( dac sinad >100). I have two sets of speakers who couldn't differ more ( " lively" vs " laid back").
The first set with a ribbon tweeter sounds a little too bright to my taste. I looked up the measurements on line that confirmed my listening experience. And as you've figured out the A6000 does not add any frequency bump or dips, the speakers sound as exact as the measurents show. In the wiim pro i set the output to " mono" and I bumped (with real small db portions) the undertuned area between 100 and 1 khz and that gave me a more balanced frequency response, then saved the custom eq set up.
With the other set with a single point source it was the opposite. The measurents where quite linear (good) but the slope of the response was quite steep resulting in a -10 db difference from 100 hz to 10 khz. So, I pushed the trebles on this one and reduced the 125 hz setting to my liking and here too, the frequncy balance was great.
But is this the solution? No. It comes with a price as I mentioned before. The EQ settings on the wiim pro prevents the unit from playing bit perfect. Even more, it adds distortion. Thus on low spl listening it's ok. But when cranking up the volume it is noticebly a bit distorted ( let's call it less refined just like from flac to mp3 , for a comparison).
1.Thanks to this amazing ASR site I was able to understand the meaning of measurents and I now got first hand experience to grasp a little of hands on experience.
2. The Audiolab A6000 is still amazing for people who like a detailed amp. Complaints about sound should be addressed to the speaker, not the amp, I think.
3. The wiim pro is a versatile streamer and will not leave the setup any time soon.
( on 2 & 3; I had my fair share of amps and streamers through the years)
Now I feel like I'm hijacking your thread, but I thought I'd share my journey with the A6000 as well if you don't mind.