> 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/koss/pro-450.md).

# Pro/450

<figure><img src="https://31762434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4NrSugToAwYkW0a8hV%2Fuploads%2FaI01ZHf2Gu7z7yQN0cu5%2FKoss%20Pro450.jpg?alt=media&amp;token=a1475fcb-5096-4729-bb87-610b1e0f18e4" alt=""><figcaption></figcaption></figure>