An Exclusive Ride for Fiio Players, Fiio X series music player X1, X3II, X5II, X7 and the DAC/Amp E17K utilize a 11-pin micro USBport and may realize exclusive docking expansion functions such as amplification and charging.
Current feedback amplification with low output impedance. Utilizing TI's TPA6120A2 current feedback headphone driver, the K5 utilize exclusive technology to lower its output impedance to a transparent <1Ω and increase its maximum output power to up 1.5w@32Ω. Utilizing an extra current amplification stage comprising an internal high efficiency, low noise power supply, the K5 has high current output, satisfying high dynamic program material, and has three gain setting suitable for headphone of different sensitivities.
Compared to the last-generation E-series products, the K5 has made breakthrough stride in exterior design and craft, with lower tolerances for all joints and seams, more high-quality sanded surface finish and an indented front bezel assembly for a further upgrade in appearance.
When the K5 power on/off, the dockedX1, X3II, X5II, X7 or E17K will power on/off in sync, a great convenience for users and a sign of complete integration of docked devices.
Beside docking function, the K5 also has standard line input for other sources components, and secondary dock input and USB pass through input.
*Secondary dock input is for docking with X1/X3II/X5II/X7/E17K via exclusive USB cable instead of topside dock
*USB input passes USB signal through the docked FiiO device to realize its USB functions such as USB storage read/write.
The K5 realizes further amplification of X3II/X5II/X7/E17K's DAC signal by directly connecting then to USB source through USB IN port and receiving the decoded line signal through the dock for amplification.
Besides regular RCA output, the K5 also possesses balance line output function when docked to the X5II or X7, and can be connected to other professional amplifier components for even better sound effect.
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Speaker (Passive) Amplifier
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