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8.1 out of 10 based on 38 reviews

Sony MDR-RF4000K

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  • User Score (30)
    8.1 8.1 from 30 reviewers
  • Expert Score (4)
    8.5 8.5 from 4 reviewers
  • Design (2)
    6.9 6.9 from 2 reviewers
  • Value for money (3)
    7.9 7.9 from 3 reviewers
  • Ease of use (2)
    8.2 8.2 from 2 reviewers
  • Sound quality (4)
    8.5 8.5 from 4 reviewers
  • Durability (3)
    7.9 7.9 from 3 reviewers
  • Overall quality (2)
    8.2 8.2 from 2 reviewers
  • Usability (2)
    6.9 6.9 from 2 reviewers
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  • Score Distribution

Experts:
9-10
(1)
7-8
(3)
5-6
(0)
3-4
(0)
1-2
(0)
Users:
9-10
(10)
7-8
(13)
5-6
(4)
3-4
(1)
1-2
(0)
  • Expert Reviews

  • WikiFreak Description

Sony MDR-RF4000K

The Sony MDR-RF4000K is a closed cordless headphone designed in a black form factor, and supports 12-22,000 Hz frequency response, a 40 mm driver unit, a 30 m reception range, 10 + 10 mW output power, and is powered by batteries that provides users with up to 7 hours (on AAA) or 10 hours (NiHM) of operation time. The Sony MDR-RF4000K supports a mini to phono, unimatch plug connecting cord, built-in volume control, one channel, and comes with a charging dock / storage case, circum-au…

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Sony MDR-RF4000K

The Sony MDR-RF4000K is a closed cordless headphone designed in a black form factor, and supports 12-22,000 Hz frequency response, a 40 mm driver unit, a 30 m reception range, 10 + 10 mW output power, and is powered by batteries that provides users with up to 7 hours (on AAA) or 10 hours (NiHM) of operation time. The Sony MDR-RF4000K supports a mini to phono, unimatch plug connecting cord, built-in volume control, one channel, and comes with a charging dock / storage case, circum-aural earcups and an AC power adaptor. The Sony MDR-RF4000K weighs 300 g.

Features

The Sony MDR-RF4000K digital cordless headphone supports up to 30m range and a circum-aural design that allows users to utilize the headphone for long periods of time. It has a 40mm long stroke diaphragm and Digital Radio Frequency transmission for sound output. It also comes with a storage case that doubles as a cable-free battery charger. The headphone’s closed-type design reduces sound spillage, and a parallel-link self-adjusting headband allows for comfortable use. Other features on the headphone include a volume control on the headphone, a design allows up to 7 hours continuous listening time between charges of the NiMH battery, and an auto power-save feature which switches off the headphone when it’s not being used. The MDR-RF4000K is available from April 2010.

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  • Manufacturer's Description

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