Sony MDRAS20J Sport Headphones

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Sony MDRAS20J Sport Headphones

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Item Description

The Sony MDRAS20J Sport Headphones are designed to stay put while you are out exercising or playing games. This set has an ergonomic style that features an ideal look while also providing the clarity that you desire. With a 13.5mm driver, you have plenty of options when using these headphones. The Sony sport headphones contain neodymium magnets that give outstanding bass performance, letting you really experience your music as you work on a healthy lifestyle. This piece has a vertical, in-the-ear, clip-on form that makes it simple to keep on no matter how active you get. These ear buds come with a convenient clip for keeping your cord in place, as well.

Sony MDRAS20J Sport Headphones:

  • Impedance: 16 ohms at 1kHz
  • 13.5mm driver
  • Neodymium magnets for outstanding bass performance
  • In-ear sport headphones have a cord length of 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 1 out of 5★ by DO NOT PURCHASE I bought a pair of these and after about a month of use I noticed the right earbud began to lose sound quality and is now completely inoperable. I will not purchase these again and would advise others not to as well. 06/03/2010
Rated 1 out of 5★ by Very Disappointed Left side stops playing after about 20min of workout. Thought it was gettting wet from sweat but started wiping sweat off during run? This did not fix the issue. Run inside in AC so its not that much moisture but it stops working every workout. 03/29/2011
Rated 1 out of 5★ by The worst pair of headphones that I have ever purchased. I went through three pair and returned all three pair. The right earbud always stopped working and the left one would get a static noise. i was refunded for all three pair, however it was inconvenient. I went back to using the Apple ear buds that come standard with the ipod. 10/15/2009
Rated 1 out of 5★ by Don't buy!! Not only does the right ear bud short out as soon as a drop of sweat touches them, they constantly keep coming out of my ears. This happens EVERY time I work out. Since I work for a living, I don't have time to keep going to a store to buy new headphones, therefore I've become an expert on how horrible these are because I'm forced to use them!! I look forward to the day that I can hear my music while I workout. 09/03/2010
Rated 1 out of 5★ by Have also experienced problem w/Right Earbud I was happy with these at first - I've never had good luck with this style of headphone before, but the added "nub" that fits behind the ear and the closed-loop design makes them stay on better than other models I've tried.The sound quality is "ok" - nothing amazing but it works. Unfortunately, after three weeks of use the right earbud became "muddy" sounding and only plays at about the third of the volume it is supposed to. I don't know if it is the "water-resistant" design failing, and sweat damaging the interior, or if there is a problem with the wiring, so that the full signal isn't getting to the headphones. Regardless, I'm already shopping for a new pair of headphones. I do not recommend these, and overall I'm very disappointed in the product. I used these headphones while distance running.I have previously owned one of Sony's "over the head" style sports headphones, and I had much better results with that, and will be sticking to that design in the future. 10/29/2011
Rated 1 out of 5★ by Beware of this product Bought these to replace a pair of 3-yr old Skull Candy ear buds. The SC buds had a straight plug and failed at the strain relief - one channel had intermittent connection. Probably failed because of the way I run the wire while I'm exercising.Purchased these on Dec 18 because they were a sport-type and had a 90-deg plug. Today, Jan 2, the left channel has a significant decrease in output - it sounds like I only have one phone in. I verified that it is not the iPod, nor is a L-ear vs. R-ear matter. The phones are broken after two weeks...Other knocks against them is that they feel like they will fall out all the time, and they tangle too easily when I'm not wearing them.Unfortunately I don't have the receipt anymore so it looks like I will be eating the $18 that they cost. 01/02/2012
Rated 4 out of 5★ by Not Bad I bought these about a year ago and love them. They were great for the price and stay on well. But over time one earbud got to have a lower volume. I think i'll shell out the money for a more expensive pair this time. 02/28/2012
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