The SRH840A have large 40mm drivers that deliver a broad frequency response of 5 Hz to 25 kHz for rewarding bass, intelligible mids, and extended treble. The closed-back, circumaural design helps reduce ambient noise and the thick replaceable earpads yield long-lasting comfort. The wide headband is adjustable and generously cushioned to ensure a pleasing fit on a range of head sizes.
The coiled, single-sided cable allows a variable amount of slack, resists tangles, and can be detached for easy replacement. It has a bayonet clip to keep it securely attached to the earcup. The gold-plated 3.5mm TRS mini plug and 1/4″ adapter enable compatibility with MP3 players and mobile devices as well as DJ mixers and audio interfaces.
- New Look over SRH840
- 40mm Neodymium Dynamic Drivers
- Closed-Back Over-Ear Design
- Foldable Construction
- Replaceable Earpads
- 5 Hz to 25 kHz Frequency Response
- Single-Sided, Coiled, Detachable Cable
- Gold-Plated 3.5mm TRS Plug
- 1/4″ Adapter and Carrying Bag Included
- Includes Spare Earpads
More information found here – Shure