It has amazing bass boost and does a great job boosting my Xperia Z2 (which we all know has the lowest speakers on most high end phones ). It's also great if you don't want to worry about rooting your Android phone just to boost the sound. (There's still no easy way to root Lollipop and Xperia Z2 if you don't know what you're doing. As for the device itself, I like the dual headphone jack, it will also come in handy when I want to share music using only headphones on the go. Personally I bought it to use over the FM transmitter in my car stereo and it has amazing and clear bass! There are too many bad reviews about Fiios so I chose this one. If you have doubts about Fiio, choose this headphone amplifier!
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