hi i have a question i have hd558 along with ipod classic 5.5 gen with rockbox installed. DO i need fiio e11 or any portable amp or it wont make any difference?
currently my ipod works fine with grado sr60i and koss ksc75 moded
Your looking to improve the audio quality of your HD558 plugged into the iPod?
The E11 comes with bass boost, so you should at least get a little more bass with the E11.