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Sony MDR-AS20J Active Series Headphones

by Sony
4.0 out of 5 stars  See all reviews (150 customer reviews)

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  • Newly developed loop hangers prevents headphones falling and fit a wide range of ear sizes
  • Soft loop hangers for comfortable fitting
  • Lightweight clip-on style (vertical in the ear)

Product details

  • Product Dimensions: 10 x 10 x 10 cm ; 14 g
  • Boxed-product Weight: 454 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: MDRAS20J.AE
  • ASIN: B00165R8XU
  • Date first available at Amazon.co.uk: 17 Mar 2008
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (150 customer reviews)

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews
65 of 67 people found the following review helpful
5.0 out of 5 stars Hi-Fi in the Gym -that does not fall off! 11 July 2008
Verified Purchase
I do not like headphones that totally seal in my ears, as this does not do much for my eardrums. Normal in-ear headphones simply fall out so often. I have tried the type that clip over the ear, which are better, but with some energetic exercises these still fall off. I like the fact that they sit in the ear, without sealing it, so give better volume than the type that sit outside.
This new Sony design is great, easy to use, comfortable and it stays in place (it is even splash proof) and of course the sound quality is as you would expect SONY (they were first tried with my 8Gb Sony Walkman, but they also improved the quality from a Philips MP3 player). At this price I think these are great value and quality.
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12 of 12 people found the following review helpful
I bought these headphones after reading several highly positive reviews. However, when I first wore them I was very disappointed by the sound, which was thin and tinny. By pressing the ear pieces deeper into my ears, I noticed an immediate and massive improvement in the sound. All well and good, but you can't walk around with your fingers in your ears! To rectify the problem I found that the position of the ear piece could be altered by twisting it on the rubber frame so that the sound is directed down my ear canal rather than against the inside of the tragus (the bit of the outer ear that the phones sit behind). Each earpiece sits on a curved silver plastic tube. You need to grip this tightly as well as gripping the piece of rubber frame that comes out of the plastic frame. Twist the tube until it naturally sits in an angle relative to your ear canal. You will probably need to overtwist it, because the material is quite springly and will just return to its normal position. Give it a try, if you are experiencing similar problems. This little modification has turned my pair from One star quality to Five star quality.
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3 of 3 people found the following review helpful
4.0 out of 5 stars Good value headphones 27 Feb 2013
Verified Purchase
The ear fit is very comfortable and does not slip when running.
The sound quality is adequate for the price.
The cable quality seems appropriate for the price.
The cable is aligned 90 degrees to the jack, this helps prevent sharp jerks from pulling the jack out when on the move. If you are using a bulky running carry pouch for your MP3 player there may not be enough clearance to fully insert the jack - there is about 4mm of clearance.
Overall a good set of headphones that will do the job well but won't set the world on fire.
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3 of 3 people found the following review helpful
1.0 out of 5 stars Fit badly unless you have massive ears 14 July 2011
By Rob
I bought these so I could go jogging, but they are so big (i'm a guy and have big ears)that when I jog with them they rattle around and even fall off. I would not recommend you to buy them. My previous panasonic wrap around the ears type (not a complete loop like these Sony ones)are 100 times better and I willbe re-investing in a similar pair. Buy these at you own risk but prepare to be disappointed. Also you have to rip open the plastic casing in such a way that returning them is really not much of an option.
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2 of 2 people found the following review helpful
1.0 out of 5 stars Sony MDR-AS20J Active Series Headphones 2 Dec 2010
By sc
Verified Purchase
These headphones were bought to replace another over-the-ear set which had been lost. Fortunately the orignal ones were found as this new pair are thoroughly uncomfortable and I don't think could be used for any length of time!
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2 of 2 people found the following review helpful
1.0 out of 5 stars mis-fits 5 Nov 2010
these are made for a specific size of ear which most definitely was not the same as mine. The were much too big and in fact, fell off my ears with the slightest movement. I'd hoped to wear them for running, but that will not be possible in the least.
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2 of 2 people found the following review helpful
5.0 out of 5 stars Sony Do It Again...Unbeatable Value. 24 May 2009
Verified Purchase
I don't know How Sony do it, but they keep coming up with better and better headphones. I've had a few pairs from them, and never been disappointed. I bought these to replace some Sennheiser ones which were new, only worn a couple of times, but were so very very substandard compared to even the cheapest of Sony headphones. I'll never buy Senns again they're rubbish, just cheap bass sound.
I know I can always buy Sony in future and be delighted with them. Buying on-line can be awkward if you haven't seen the product...I'd never seen these, but trusted Sony enough to buy anyway. Brilliant bargain.
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12 of 14 people found the following review helpful
2.0 out of 5 stars Beware if you sweat..... 6 Oct 2009
I, like most people, have spent lots of time and money trying to find the perfect earphones for use in the gym and in the majority of cases have ended up disappointed. These seemed like they were ideal due to the enclosed earloop design (having a hook or a loop is the ONLY type of earphone that works comfortably in the gym, believe me), the in ear piece is ideal for comfort, as they don't dig into your ear, and as long as the hook/loop holds them in place the sound quality from Sony is always good with excellent bass.

These started off brilliantly, great sound volume and bass, stayed fixed in place in my ear (only get these if you have above average sized ears), and comfortable. I had finally found the perfect pair...

But, then the big problem. I do tend to sweat in the gym (who doesn't?) and this includes in the ears too... all of a sudden the sound faded completely, to a whisper. Rubbish, I thought I had a faulty pair. But then on the next trip to the gym they were again perfect to start of with, I started sweating again, and hey presto same thing happened, and then for a third time too.

It appears they are NOT sweat or splash resistant and need to dry out before working again. This is a massive disappointment from Sony as I was previously using MDR-J20s from Sony with exactly the same earpiece and they don't have the same problem although they are earhook so can hang off your ear quite frequently.

Sort these out to be sweat/splash resistant and they would be perfect. A shame.
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Most Recent Customer Reviews
5.0 out of 5 stars Five Stars
Great sports earphones. Newer model is ore comfortable and doesn't fall out from the ears while running.
Published 16 days ago by Lina Gurskaite
5.0 out of 5 stars Great for running
I use these for running and in the gym. Holds in place and doesn't keep falling out like my previous pair. Read more
Published 1 month ago by dc
5.0 out of 5 stars Use every day at gym
I bought these as the pop in the ear ones kept falling out when running or at the gym. I love these ones as they stay put and are more subtle than the ones with the speaker over... Read more
Published 2 months ago by Sam Robertson
5.0 out of 5 stars At last, earphones that don't fall out
I was fed up with buying ear buds that never stayed in. Do I have strange ears, I asked my self. Good quality sound, too. A good find. Thanks.
Published 3 months ago by Mr R W Ford
5.0 out of 5 stars Nice!
Sit out of the ear not in very comfortable to wear. The delivery to along time but well worth the wait.
Published 5 months ago by Keith Henman
4.0 out of 5 stars Great earphones that don't fall off
I've been using these earphones for over a year now and they've been a very good purchase. I use them while cycling so they don't fall out in use which they do very well. Read more
Published 7 months ago by Terry in Hull
5.0 out of 5 stars Excellent for the price
Good sound and great for sports - I got a pair which my husband kept borrowing so I got him a pair as well and he reckons they are just as good as some much more expensive... Read more
Published 7 months ago by E Frazer
2.0 out of 5 stars Not very comfortable and still don't stay on whilst running.
For me these headphones just didn't do the trick for staying on and being comfortable whilst running or even commuting. Read more
Published 8 months ago by Amazon Customer
5.0 out of 5 stars Great for walking
These are really good headphones with great bass. I have got two sets that I always use for my walking and for on holiday. I did have three sets but broke one. Well recommended.
Published 8 months ago by Michael Henry Smith
5.0 out of 5 stars At last, earphones for glasses wearers
I've tried several types of earphones when exercising and they all have their issues, because of me wearing glasses. Read more
Published 8 months ago by Roger
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