> For the complete documentation index, see [llms.txt](https://itsgreq.gitbook.io/headphone-measurements/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://itsgreq.gitbook.io/headphone-measurements/ultrasone/untitled-76.md).

# HFI-450

![](https://lh6.googleusercontent.com/s7iV34_0VySh-wkNBvyXfwzkMJDVy0MosIGjT_Cn_7wkVzJNmedJX85uX2ulfB6-E9SeZPw-gCtLNixLO5RaHJRtetRHMDMy2JTh-KTcOifTENK4PFlEGawLi7tBei5kH8DZrAZq)