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Open-back headphones

An enclosure design, distinct from the driver technology.

How it works

Open-back headphones have an acoustically open rear enclosure. Sennheiser’s HD 414 is a documented 1968 milestone in this design history.

What to check when choosing

Editorial guidance: consider a quiet listening room and check sound leakage before using headphones near a recording microphone.

Limits of the claim

Open-back does not mean planar, and it does not establish a particular frequency response or a universal sound-quality advantage.

Sources & provenance

Primary-source confidence means the source directly documents the statement, not that every historical priority or performance claim has been independently established.

1968: An open-back milestone: HD 414 →

Models with documented support

Links use recorded specifications. Missing evidence is not treated as a negative finding.