Sony MDR-RF4000K headphones let you listen without distraction
By Jeff Salton
March 24, 2010
If you to watch movies or listen to music without ambient noise, but don't want to fork out huge amounts of hard-earned cash on expensive loudspeakers (only to be told to turn them down so the rest of the household can talk to each other), wireless headphones make a great solution. Sony's latest offering - the MDR-RF4000K digital cordless headphones - include a unique new storage and charging dock and an impressive wireless range of 30m (100ft).
As well as helping you avoid sitting on them, the storage doubles as a cable-free battery charger. After use, just fold the ear cups flat and the MDR-RF4000K cans stows away neatly while the battery recharges. Sony says digital RF transmission ensures clear, secure signal reception over a range of up to 30m. The headphones' closed-type design cuts sound spillage, which means you won’t disturb others while wearing them and high-end audio quality is delivered via a 40mm long-stroke diaphragm which accurately reproduces the sounds you are intended to hear.
The unit has swivel circum-aural cushions plus a parallel-link self-adjusting headband for wear comfort. And when your roommate starts bickering about who used the last of the milk, the volume control on the headphones lets you continue your listening enjoyment without having to reach for a separate remote.
The headphones’ NiMH battery is said to last for up to seven hours of continuous listening between charges and can be supplemented by a single AAA alkaline battery for up to 10 hours listening without a break. An auto power-save feature switches off the headphones when they are not being used, extending listening time even further.
MDR-RF810RK cordless headphones
Also released by Sony and available this Spring is the MDR-RF810RK which has a wireless range of 100m (for those who get literally carried away with their music). With that range, you could sit by your neighbor's pool and listen to your own music.
Weighing just 220g, the cordless headphones also feature a precision 40mm driver for uncompromized sound, plus a volume control for easy adjustment. It boasts 13 hours of listening time on a single charge while one AAA alkaline battery will power the device for up to 28 hours . The new MDR-RF4000K and MDR-RF810RK wireless headphones are available from April 2010. No word on pricing just yet.Share
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