[Parametric
EQ]: Through FIIOs self-developed PEQ algorithm and user interface, in any mode* you can choose the exact frequencies to be adjusted along with their gain levels and bandwidth allowing you to fine-tune the sound to exactly the way you want it.
[Independent power supply for amp]: The specially designed external power supply features low noise and high current, resulting in a 40% increase of output power to 340mW
fiio btr15