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Sony MDR-RF4000K

alaTest has collected and analyzed 323 reviews from magazines and websites. Opinions about the design and comfort are overall positive. The value for money and usability also get good feedback. Reviews are divided on the size. Many are critical about the reliability.

sound, usability, value for money, comfort, design


We analyzed user and expert ratings, product age and more factors. Compared to other Headphones the Sony MDR-RF4000K is awarded an overall alaScore™ of 87/100 = Very good quality.

Review analysis

(Based on 323 reviews)

Expert Reviews  

User Reviews  

Showing 31 review(s)

Expert Reviews User Reviews
Showing 1 - 10 of 31 Show Reviews: in English | in other languages (17)

Consumer review by:

Amazon review summary for Sony MDR-RF4000K


alaTest has collected and analyzed 90 user reviews of Sony MDR-RF4000K from The average user rating for this product is 3.0/5, compared to an average user rating of 3.9/5 for other Headphones on

sound, comfort, bass quality, usability, treble quality

51% of the reviews on give this product a positive rating.

This summary is based on the products: Sony MDR-RF4000K HeadphoneSony MDR-RF4000K Headphones

Consumer review by:



I am trying to reduce wire clutter on my work desk, so these fit the bill, but I'm not terribly impressed with them. Minus 1 star for the mediocre sound, and another for the poor battery life.

Very comfortable, no signal degradation at other side of the house from the transmitter

Sound is *okay*. The bass is a bit weak and muddy compared to the wired v900hd, but that's to be expected from wireless I guess ; The included battery pack has an 8 hour discharge, but takes *15 hours* to recharge. You will need an extra pair of...

Consumer review by:

Excellent Sound!!!


Excellent Sound. Easy Hook-up. Just wish the audio cords were longer. Otherwise I'm Very Pleased.


Consumer review by:



Works absolutely perfectly with my high end 3D BRAVIA XBR-55HX929 LED TV. Now I can watch movies into the late hours of the night and not bother anyone sleeping, while not losing a high end sound - I mean, my Sony AV amp will make the house tremble,...

Comfortable","Compact","Durable","Good Bass","Good Value","Great Sound","Lightweight","Stylish

Consumer review by:



This high price headphone uses same battery as RF925. Battery becomes useless in under a year. Replacement battery cost $25. Web site says can substitute battery pack with one AAA battery. Pack is two cel and takes two AAA batteries to replace pack....

Good sound

Poor battery life

Consumer review by:

Like the 970 better


the sound quality is not as good as the sony 970 model. Price is high for the quality.

Consumer review by:

Good Product


Read directions carefully. The cable can be hooked up in two different directions. I just substituted the cable with a RCA cable(red & white plugs on each end). The initial battery charging did take 16 hours.


Consumer review by:

Sony MDR-RF4000K Wireless Headphones


I am returning these, they\'re huge. From the photo they looked like they were ear-sized. I\'m sure they work fine, but they\'re almost as big as my head.


They\'re HUGE

Consumer review by:

I would buy this product again and again


What I like best is the crisp sound of every word while looking at TV.My wife works at home a few days a week so I decided to purchase a set of headphones as to not disturb her. After looking on-line at every headphone out there, considering the cost...

Comfortable","Good Bass","Good Value","Great Sound","Lightweight","Stylish

Consumer review by:

Great product at a great price


I use it to listen to my home stereo while I\'m working out which are in 2 different rooms.

Comfortable","Great Sound","Lightweight

Product Specifications


Active Noise Cancellation: No
Dolby PL / AC3: No
Earclip: No
Neckband: No
Noise Cancellation: No

General Features

Ear Canal Headphone:Not Applicable
Indoor/Outdoor :Indoor
Signal Connection:UHF Digital
Type:Traditional Headphone