The Beoplay A2 sounds very clean and full-bodied below half volume, better than anything I have heard in this size. Unfortunately from half volume upwards distortion starts to become noticeable especially with electronic house-kick sounds, like those from popular TR808/909 drum machines. It starts at half volume and doesn't become really worse at higher levels though, which is strange and seems like a bad DSP-tuning.
I haven't noticed any severe problems with soft acoustic music, but as soon as a track contains a kick-sound prone to this problem, the song won't sound good on the Beoplay A2 if you intend to play it at half volume or above, which is a pity about this otherwise impressive speaker.
I hope this video can demonstrate what I am talking about. As many of my favorite songs (including lots of Funk/Smoothjazz as well as House stuff) also suffer from this problem, I currently wouldn't like to recommend it to anyone without reservation despite being a great speaker otherwise.
Furthermore if you like listening at high levels not only distortion might kill the satisfaction, but also battery will die pretty soon. I didn't manage to get more than 50 minutes out of one charge at maximum volume with the Beoplay A2 it will automatically reduce the volume to half after that and will continue to play at half volume for another 50 minutes maybe. This is inacceptable for a product costing 400$ if you ask me.
The audio was recorded through binaural microphones with me sitting 50cm in front of the speakers, which you wouldn't normally do, but otherwise I wouldn't have been able to record the softer parts without too much hiss. Apart from that you can probably hear how much better stereo separation the A2 manages compared to the JBL Charge 2.
My full Beoplay A2 review: http://oluvsgadgets.blogspot.co.at/2014/11/review-bang-olufsen-beoplay-a2-sounding.html