The XB50AP are in-ear headphones which focus on the bass, giving a lot of punch and low end which makes them perfect for bass lovers.
These feature an in-line remote which allows you control basic functionality of your smart phone or music player.
While lightweight, these are quite substantial in size for in-ear headphones, so they can be quite the hassle when used on the go.
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Pro Comfortable for continuous use thanks to the light weight and soft and flexible eartips
The MDR XB50APs are fairly lightweight. Combined with the high quality ear tips that are soft and flexible, there is not much pressure in the ear canal while maintaining a good seal, making them for wearing for straight periods of time.
Pro You can easily control phone/music player functions thanks to the inline control button
These in-ears come with a single button remote control which allows you to answer/end calls as well as pause/play tracks. This minimizes the need for you to pull out your phone or media player to perform these functions.
Pro Great low end which is complemented by clear mids and fairly good highs
The low frequencies is what stands out with these in-ears' sound signature. Bass goes pretty low and with good punch too. Also, this low and full bass is achieved without muddying up the mids. The mids are smooth and clear, allowing vocals and guitars to be clearly heard. The highs are present, though slightly recessed, giving these headphones an overall warm sound.
Pro Cable does not tangle easily due to the flat design and high quality materials
The MDR XB50AP cable is flat and fairly thick, yet still is quite flexible. The cable does not tangle easily even when chucked into a bag or pocket.
Con Can be distracting to wear on the go due to microphonics
When the cable moves around while you are wearing these on the go, and it rubs against your clothes, the sound can be heard. This can be quite distracting, especially if you like to focus into your music.
Con Treble can sound recessed for some
While the bass in these headphones is powerful and full, the treble has taken a bit of a step back. While there is still a good level up on the high frequencies, these do not have the airiness and sparkle that more detail oriented headphones have.
Con Earpieces are quite bulky
The earpieces of these headphones are quite big and stick out of the ears quite a bit. It is possible that you will find these to be quite straining on your ears. Also, these can be quite uncomfortable to use when you are lying down on your side.