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Technical Details
- Technical Information--Connectivity Technology--Wireless::Technical Information--Wireless Technology--RF::Technical Information--Wireless Operating Distance--100 ft::Technical Information--Sound Mode--Stereo::
- Technical Information--Minimum Frequency Response--10 Hz::Technical Information--Maximum Frequency Response--22 kHz::Technical Information--Plating--Not Applicable::Earpiece--Earpiece Design--Over-the-head::Earpiece--Earpiece Type--Binaural
- Interfaces/Ports--Host Interface--Not Applicable::Physical Characteristics--Form Factor--Ear-cup::Physical Characteristics--Weight (Approximate)--10.60 oz::
Product Details
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Product Description
Unplug and enjoy. The MDR-RF4000K digital wireless headphones system gives you the freedom to travel up to 100 feet from your sound source while delivering phenomenal sound. This system includes Ni-MH rechargeable batteries, 2.4GHz RF digital transmission and headphones with a 40mm driver for deep bass. Includes charger and ultra-long battery life.General Information--Manufacturer--Sony Corporation::General Information--Manufacturer Part Number--MDRRF4000K::General Information--Manufacturer Website Address--sony::General Information--Brand Name--Sony::General Information--Product Model--MDR-RF4000K::General Information--Product Name--MDR-RF4000K Headphone::General Information--Product Type--Headphone::Miscellaneous--Package Contents--MDR-RF4000K Headphone AC Power Adapter Connecting Cable Card warranty Rechargeable Nickel-metal Hydride Battery Unimatch Plug Adapter Operating Instructions Replacement Battery Stand::Warranty--Standard Warranty--90 Day Limited::Technical Information--Connectivity Technology--Wireless::Technical Information--Wireless Technology--RF::Technical Information--Wireless Operating Distance--100 ft::Technical Information--Sound Mode--Stereo::Technical Information--Minimum Frequency Response--10 Hz::Technical Information--Maximum Frequency Response--22 kHz::Technical Information--Plating--Not Applicable::Earpiece--Earpiece Design--Over-the-head::Earpiece--Earpiece Type--Binaural::Earpiece--Driver Size--1.57"::Interfaces/Ports--Host Interface--Not Applicable::Physical Characteristics--Form Factor--Ear-cup::Physical Characteristics--Weight (Approximate)--10.60 oz::
Customer Reviews
Most Helpful Customer Reviews
23 of 25 people found the following review helpful
Amazon Verified Purchase
I ll keep this short simple and straight to the facts . A lil pricey but plenty worth it . flexible connection options with straight forward , simple hook up and operation . Incredible range , much better than advertised or listed ! Incredible sound , easily on par with Sony Studio Monitors only wireless !!! Multi position mountable base that acts as the transmitter with dual indicator LED's for charging and transmitting , self power off when not in use , auto on feature built into the head strap and independant volume control in the left ear hub . Comfortable enough for extended use and light enough to almost forget they're on your melon ! BUY THEM !
24 of 27 people found the following review helpful
Amazon Verified Purchase
These headphones replaced a pair of Sennsenheiser headphones that I bought about 3 years ago. So far these are working just fine. I like that they only turn on when you have them on. The sound quality is very good. I also like that once they are fully charged the charging light turns off. At one end of my house i get a little interference that i didn't get with my other headphones. But that is not a major problem. One thing is they could be a little tighter and i don't see any way to adjust that. I would definitely recommend them.
20 of 22 people found the following review helpful
Amazon Verified Purchase
I needed this because I often watch TV from my kitchen late at night with the family is sleeping. The kitchen is more than 30 ft from my family room and this headphone does the job well; sound is clear (CD quality as advertised) and I do not have any issues with its range. I wear it even to our 2nd floor bathroom (our TV is on the first floor) and I could still hear the sound very clearly (only when I walk to the corner of the 2nd floor, which is a good old 150' from the transmitter, the sound becomes broken, so the range limit is as advertised). The only thing that I wish for is it if has virtual surround, but the other surround wireless headphones that Sony offers only have limited range so this pair is as good as I can get. Oh and the headphone is very comfortable to wear, and I love the wireless charging feature--you simply put the headphone back to the docker and it charges automatically.
Most Recent Customer Reviews
Batteries dying after three months...
Pros: 1. The headphones seem to have decent fidelity, and 2. the range is fairly good.
Cons: 1. The battery pack (2 AAA's) is dying after three months. Read more
Cons: 1. The battery pack (2 AAA's) is dying after three months. Read more
Published 24 days ago by roj
Terrible Reliability
Garbage, after 7 months of light use the sound stops every 10 minutes. I have to take them off my head, push the earphones together and put them back on my head to get the sound... Read more
Published 1 month ago by hawk
Great for the Money!
Great headphones for the money. I was originally looking at the Sennheiser wireless headphones, but couldn't justify spending the extra dough for the 170s. Read more
Published 1 month ago by Muso1234
Great headphones...when they work.
I'm on my second pair of RF4000Ks, after having the first pair replaced under warranty for the intermittent turning off issue mentioned in many of the other reviews. Read more
Published 1 month ago by James Mack
physically broke apart second day of use
sound and technical quality are fine - Sony-level audio equipment fine - but construction is flimsy - the battery cover/left earcup snapped off the second time I used them and... Read more
Published 1 month ago by juvon
Sorry excuse for headphones
Let me start by saying I am typically a fan of Sony products. We have two of their Bravia flat panel HDTV's and they are paired with Bravia Bluray players. Read more
Published 2 months ago by MichiganMarty
Problem after 6 months -- sound cuts out
So, like others who have mentioned this in other reviews -- the sound starts to cut out after about 6 months of average use (I bought mine at the end of July 2011, so maybe there... Read more
Published 3 months ago by Shari Maser, author of Blessingways: A Guide to Mother-Centered Baby Showers -- Celebrating Pregnancy, Birth, and Motherhood
Should Come With Warning Label
The warning label should say: "This product works just like it should." That's it.
Easy to set up, easy to use, and the sound quality is great. Read more
Easy to set up, easy to use, and the sound quality is great. Read more
Published 4 months ago by Jerry Hyde
Flawed.
Before I begin, let me state that the majority of the 5-star ratings have a consistent theme. They all are happy that they own a set of wireless headphones. Read more
Published 4 months ago by MPR
Failed quickly.
As others have noted, the strap that allows the headphones to automatically turn "on/off" when you place them on your head failed in just 3 months of light usage. Read more
Published 4 months ago by Jeezer
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