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+[We provide a frequency response measurement here](https://ploopy.co/wp-content/uploads/2023/02/HD6XX-Ploopy-FR.jpg) that we believe is representative of the overall sound quality of our Headphones. This appendix will explain what the graph means and what information it includes.
+
+## Comparative measurement
+
+To provide context for the provided measurement, the Ploopy Headphones aren't measured independently. Rather, we contrast it with a measurement for the Sennheiser HD6XX.
+
+In the graph, the blue line is the Ploopy Headphones, and the grey line is the Sennheiser HD6XX.
+
+Given that the frequency responses for the HD6XX is well-known, accurate comparisons can be made between "official" frequency response graphs for the HD6XX and our measurement.
+
+## Our measurement setup
+
+![](https://lh3.googleusercontent.com/pw/AMWts8CITKxpBVBhTt6fj6gn7ws0x2eHrGuNe22_swZ__h4xTjkZaj_p1tKYA4x-uqvDzL1zcrTPoKMGG_TazVd-0Tckb9p38EUJyLI_D1kbzmOk51f9uXLg4Pnq4NXqCh9YYiM9jJZcJiO-yvsXrOB6SCO8=w1470-h955-no?authuser=0)
+
+For information on how we measured the frequency response, please see [[Appendix F: Frequency response testing methodology]].
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