Sony MDRAS20J Sport Headphones

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Sony MDRAS20J Sport Headphones

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Item Description

The vertical, in-the-ear active style MDR-AS20J headphones makes it easy to add a heart-pumping soundtrack to whatever you may be doing. The soft loop hangers fit comfortably over your ear and allow you to play hard without fear of unexpected earbud dropout. There's also a handy cord clip for unfettered activity.
  • Impedance: 16 ohms at 1kHz
  • 13.5 mm driver
  • Neodymium magnets for outstanding bass performance
  • Cord Length: 3.9'
  • Vertical in-the-ear clip-on design
  • Includes clip for securing the cord

Good, bad and bottom line - CNET Reviews


The Sony MDR-AS20J earphones are inexpensive, uniquely designed, and offer an understated style. A detachable clip keeps the cable out of the way during activity.


The Sony MDR-AS20J ear loops are not adjustable and some users will not be able to achieve a secure fit. Package doesn't include a case or any extras. Some music sounds muffled.

Bottom Line

The Sony MDR-AS20J Active Headphones are a suitable choice for MP3 player owners who simply want a more secure pair of earphones for the gym, but don't need better audio quality than that of stock earbuds.


Product Type: Headphones
Weight: 0.5 oz
Additional Features: Gold-plated plug
Recommended Use: Portable audio system
Connector Type: 1 x headphones ( mini-phone stereo 3.5 mm )
Cables Included: Headphones cable - integrated - 4 ft
Headphones Type: Headphones - binaural
Headphones Form Factor: Over-the-ear
Connectivity Technology: Wired
Sound Output Mode: Stereo
Impedance: 16 Ohm
Headphones Technology: Dynamic
Sensitivity: 104 dB/mW
More Information
Model No.: MDRAS20J
Shipping Weight (in pounds): 0.1
Product in Inches (L x W x H): 8.25 x 4.25 x 1.5
Walmart No.: 000512571

Customer Product Reviews

Rated 2.6 out of 5★ by 23reviewers.
Rated 5 out of 5★ by Great for cycling I need headphones that stay in my ears. Normal buds simply don't work. These fit comfortably over my ears, and sound quality is adequate when I'm out road biking. 08/05/2012
Rated 5 out of 5★ by Enjoyed these earphones for years To be honest, I really don't know how long I have owned my Sony earphones. They have outlasted more than one mp3 player. The sound quality has been great from day one and I would be happy to have another pair just so I wouldn't have to constantly be plugging and unplugging them from all the things I need earphones for. Since I have never had the slightest bit of trouble with my earphones I can't imagine the problems the other reviewers have had. I know that Sony just like any other manufacturer can have a lemon among all their good products. I would recommend these earphones to anyone. Now that I have written this review I think I will take my own advise and buy another pair. 04/24/2012
Rated 1 out of 5★ by Did not stay in place I bought these headphones for the gym hoping that they would stay in place during moderate exercise. The speaker was large and uncomfortable and the surrounding plastic provided no support as it didn't even come in contact with my ear. These may be okay for a man, but as I am a smaller woman, they would not stay in place. Instead of going to the gym, they are going back to the store. 05/15/2012
Rated 1 out of 5★ by Disappointed purchase I had seen someone at the gym with this headset and looked interesting. I bought them at night, worked out the next day and the left side stopped working by end of workout. Very disappointed. I will return and try again, but by the other reviews I will not have any luck. 12/30/2009
Rated 4 out of 5★ by 3rd Pair of Headphones in a Year I seem to constantly break headphones. This is my 3rd pair in a year, and it seems to be working out. Also, these DO NOT fall out when running which is great.The only problem I have is that one cord should be longer than the other like some other headphones I've had so the cords are behind you. Only complaint. 05/20/2009
Rated 1 out of 5★ by Do not purchase: Right speaker fails routinely Do not buy these headphones. I've purchased two pair and neither lasted more than a month or so before the right speaker failed. They should pull this off the market. They are a waste of money. 04/15/2010
Rated 5 out of 5★ by These headphones have even Bose beat! I bought these headphones last April and I have to say that these are the best pair of headphones I've ever owned. I bought these after my two pairs of Skull Candy earbuds broke. The sound quality on those were great, but they were terribly unreliable. My brother had a $100 set of earbuds from Bose, and like the Skull Candies, they broke in a short period of time. I put these on and WOW!!! The sound quality is better than both the Skull Candy and the Bose earbuds, for a fraction of the price of the latter. I would buy another pair, but at this rate, I think these will last me a good 10 years. Simply amazing! I don't know how anybody could complain about these headphones. 02/17/2010
Rated 1 out of 5★ by Poor Quality I have bought 2 of these earphones and the right earbud has shorted out on both of them. 08/31/2009
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