Error on the product: I received the E11K Kilimanjaro? the replacement for the E11, on which one can not replace the battery. Critics are better than the E11, so I test the E11K. By adjusting the potentiometer to maximum with a kids gain the volume does not exceed that of Fiio X1, degrading the sound: -The Severe are increased but less tense with the "bass boost". -The Media are less accurate, less clear. -The Less crystalline treble, the sound stage closes on itself, there is much less than the width X1 Fiio without amp E11K. CONCLUSION: The E11K does not fulfill the role entrusted to him to the extent it degrades son.Certe, it offers more bass and more punch for driver headphones a little energy (in high gain) but producing a blast unpleasant to listen. I will make a return to claim a refund from AMAZON.
