Fiio k5 docking headphone amplifier dac the new fiio k5 compatible with the fiio x1 x3 2nd gen x5 2nd gen and the x7 players and e17k is the latest docking station from fiio utilizing tis tpa6120a2 current feedback headphone driver the k5 utilizes exclusive technology to lower its output impedance to a transparent 1 ohm and increase its maximum output power to up to 15w32 ohms utilizing an extra current amplification stage and comprising an internal high efficiency low noise power supply t