A few days ago, we started with 620, and the attached earphone sound quality was called garbage ... Equalizer plus Dolby earphone, without good earphone, you can't hear the effect, especially Dolby earphone sound effect. The attached headphones for testing, ip4 headphones and Philips p 1000 can't perform perfectly. After using AKG K450, the sound effect is obviously improved, and it has performed well in dolby surround. To sum up, if you want to listen to music with wp8, you can't listen to anything without good headphones, whether it's Lu Mei or HTC8 series, whether it's Dolby headphones or beats. It's better to play with my colleague's dream rabbit the other day. ...