I haven't tried Sonarworks and will check it out if it can be made to work with Roon. But I have tried Audeze's "Reveal" DSP plug-in for Roon that is specific to my LCD-4 headphones. Like the the Sonarworks, it can be dialed in from 0% (Dry) to 100% (Wet). And there are two filters to choose from: "low latency" and "linear". I played with it a bunch when it first came out, but haven't used it in about a year b/c I found I lost some detail.
Does anybody here know how these EQ-type thingies work? In the case of Roon, J-River, etc. players, I figure they must be doing their magic before the DAC. If so, do they first convert the digital to analog, then manipulate the analog and convert back to digital (DA->manipulation->AD) before sending the adjusted signal to the DAC? Or do they act directly on the digital signal itself? Or follow some other process?
I am pretty ignorant about the digital to analoq conversion process, but would think that additional DA and AD conversions via your computer's processor might not be a good thing, sound-wise. But I could well be wrong.
cheers, Derek