FiiO K15 Highlights:
-Class-AB transistor current-boosting headphone amp circuit
-Powerful 3000mW + 3000mW balanced output
-Dual AKM AK4497S DAC chips
-Two ultra-low phase noise femtosecond crystal oscillators
-3.93-Inch touchscreen

Dual High-End AKM DAC
The FiiO K15 is among the first to use two of the new high-end AKM DAC chips, the AK4479SVQ featuring the upgraded 'Velvet Sound' audio technology. The chips achieve low distortion, a wide dynamic range, and extended signal bandwidth, all at low power consumption. Rich detail is retained in both low and high frequencies for a natural and immersive sound experience.

Discrete Architecture
Within the K15 is a carefully designed discrete headphone amplifier circuit, featuring an OP + transistor current-boosting design. A complementary pair of the classic ON Semiconductor MJE243G/253G delivers high current and low impedance output. This discrete circuit can achieve balanced output power up to 3000mW + 3000mW, allowing the K15 to effortlessly drive both full-sized headphones and in-ear monitors, producing smooth, natural, yet melodious sound.

Fully Balanced Audio Circuit
From DAC decoding, low-pass filtering, and gain control to headphone amplification, the K15's audio circuit is a fully differential design. Such a design ensures wide dynamic range while also effectively reducing crosstalk, minimizing noise, and enhancing the quality of sound.

Technical Specifications:
DAC: Dual AK4497S
Output Power:
SE: 1400mW @32Ω
BAL: 3000mW @32Ω
THD+N: 0.00054%
Bluetooth: 5.1 (LDAC/aptX HD)
Inputs: USB/Coaxial/Optical
PEQ: Supports 10-band PEQ (No PEQ processing in line input and balanced input)

In the Box
FiiO K15 DAC/amp
AC power cord
Remote control 
XLR4 decorative plug
Fuse
(2x) USB data cable
Headphone plug adapter
Warranty card
Quickstart guide