Hi first i should say that im not a good reviewer.So here we go!   first i just bought the arrow 4g 5 hours ago.And burn for 3 hours. i should say the sound is very good you can make it flat or colour it the way you like.   the gear that i use: shure se535,the arrow,and fiio    Built quality very sturdy and strong.Small but powerfull. the casing is matt black with 2     the bass punchy,tight, there are 3 level of bass.Personally i choose 1,but sometimes 3,   the treble not to brigt.Sound separation is good.  ...