The higher the recorded level of high frequency content the more the HF response decreases.
This reminds the inverse Fletcher-Munson curves of our brain. And also reminds the singer actor voice effort curves.
It also reminds what an HF disc cutting limiter does. Example the Ortofon STL 631.
And also reminding of the Orban Optimod processing in FM broadcasting. For example the Orban 8000 A.
A great HF content is like a high bias current reducing sensitivity at HF.
References:
Audio tape cassettes - Lely, Missriegler - Philips Technical Review
Orban / Broadcast Optimod FM Model 8000 A Operating Manual
Flat frequency responce from singer's vocal chords to listener's brain, Sound Picture recording and reproducing characteristics - Loye, Morgan - Journal of the society of motion picture engineers
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