X5R capacitors derate to about roughly 85% when DC voltage is applied, from what I have been told.

Does this have an effect on high pass filters, even though HF filters off DC (0Hz)?
If I wanted to test voltage derating on capacitors and its effect on an AC signal, how would I do so?

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[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/LG6KA.png
  [2]: https://i.sstatic.net/EGmPu.png