Warm, good sounding player with no harshness. Spacious and natural sound. Easy to listen for long time without any fatigue. In comparison Fiio x5 II sounds more neutral, dry and analytical with harshness on upper mids and less sense of space. Everything feels more intimate and up close with X5. I prefered  AK JR over Fiio with most genres with my headphones. I did quick listening to AK70 and couldn't hear any major difference between AK70 and JR. Negatives: JR's DAC function doesn't work! I read it's common problem with Astell Kern Jr and some other...

Portable audio became my hobby some year and a half ago, when i bought my first expensive headphones. I discovered lossless formats, loudness war, this website. I experimented with so called high-res audio. I was trying new headphones. I replaced my old mp3 player with Cowon x9, then Fiio x3, then Sony Walkman NWZ A10. I switched for more expensive Audio Technica ES10 headphones. Two months ago i was browsing head-fi and discover existence of Studio players from Hisoundaudio. Old school look, exceptional battery life, good references about their...

Best sound i ever heard from closed-up portables. Every headphones i have tried after es10, sounds boring, without bass and muffled. I was never after big opened up headphones for home listening. No doubt ES10 cant compete with those. But in category of portable headphones, es10 is the king. And here is why:   Sound bass - 53mm drivers can produce bass, which 42mm cant. It is not just about quantity, but also about how low it goes and how detailed and accurate it is. soundstage - very close due to its slim profile highs - no harshness or...

Compared to Fiio x3, there is no big differences in terms of sound to me. It has different sound signature, but i would say its on same quality level. Compared to Fiio X3, it has less bass and its bass is more soft ("vinyl like"). There is also less sub bass. X3 feels more live and engaging, whether this player feels more balanced. Clarity and details are on pair, if not slightly better with A15. There is no hiss. Its sound qualities are very surprising to me, considering its size and battery life. I would presume though, that due to its small...