Its own baseline
Each model's correction is built from its measured frequency response, not a guess.
Every headphone colors sound its own way: one pair buries the vocals, another sharpens the highs until they sting. Most apps ignore this and EQ a headphone they have never met. Atrium starts from your exact pair's measured response, drawn from the open measurement community (23 labs and reviewers, including oratory1990 and crinacle), eases it toward neutral while keeping the character you bought it for, then fits the result to your hearing.
Each model's correction is built from its measured frequency response, not a guess.
Atrium applies a gentle version of the correction, so the rough spots go and the signature stays.
Your hearing profile layers over the headphone correction. Two people, same pair, different tuning.
The eight brands with the most measured models. Every model has its own page with the full EQ settings, free to copy into any equalizer.
All 653 brands in the library, with the number of models measured for each.
Atrium is free to download. Headphone corrections are part of Signature Edition; the free app includes a generic profile.