i want to know that amp can improve signal ...but original audio source should be good too.....so quesion is do mobile have a good audio output to make a huge diff when u use a amplifier to it....is it worth the investment which is approx 60$ fiio E11......i wanna buy becoz i have a headset ath-m50's and i want to get the full out of my headset...i dont want my mobile to bottle nect it....ty