These charts will also make their way off the site, which makes it pretty likely that they'll be viewed out of context as well.
This is the most challenging aspect of this project.
There are really three things that matter to listeners:
1. Whether the resolution/SINAD is outside the range of human hearing;
2. Whether it is inaudible when the source material is played at reference levels; or
3. Whether it is likely to be audible when played below reference levels.
Everything else is, from a
listener's perspective, irrelevant.
I raise this because there are many metres one may follow looking at this from a technical perspective. These have to do with a device's ability to exploit source material up to a certain level (16 bit, 24 bit etc). The problem with this approach is that one must explain where the practical limits lie, which highlights the futility of figures past a certain point outside the summation of all noise throughout the audio chain. (The SINAD of a DAC isn't something one should ignore, But it is more correctly considered within the context of the SINAD of other devices in the audio system.)
Albert Einstein once said that it is important to keep things simple... but not too simple. So the question is what a colour coded system serves.
If it helps to delineate performance for more in depth analysis/consideration, then so be it. If it becomes an info resource onto itself, then there's some risk to be managed. If it serves as a comparative tool to show practical performance differences between DACs, then some real health warnings must be applied.
So before getting too far ahead with this project, it might be helpful to define the objective that you're trying to achieve.