> 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/sennheiser/hd540-reference-ii.md).

# HD540 Reference II

<figure><img src="https://31762434-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4NrSugToAwYkW0a8hV%2Fuploads%2FMtr3Od2RIkefblK4SiTD%2FSennheiser%20HD540%20Reference%20II.png?alt=media&amp;token=0281909f-d5ae-48ec-8dff-9789628c55f2" alt=""><figcaption></figcaption></figure>