Features
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Dual AKM AK4497S DACs with fully balanced audio circuit
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Discrete Class-AB headphone amplifier with transistor current boosting
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Eight operating modes:
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Streaming (Roon Ready, AirPlay)
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Local playback (USB storage)
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USB DAC
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Bluetooth decoding
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Optical decoding
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Coaxial decoding
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Single-ended line input
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Balanced line input
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Physically separated power, digital, and analog circuit boards
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Built-in low-noise industrial-grade power supply with external DC power option
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Multi-stage analog power supply with 14 LDO regulators
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Dual femtosecond crystal oscillators for precise clocking
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High-quality capacitors and silver-plated oxygen-free copper wiring
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Dual-core X2000 processor and ESP32-S3 MCU for efficient system control
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Multiple control methods: touch screen, knobs, remote, and FiiO Control App
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10-band PEQ on all digital inputs
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Multiple protection systems (temperature, overvoltage, overload, DC, overcurrent)
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Wired and wireless connectivity (Gigabit Ethernet + dual-band Wi-Fi)
What's in the box
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K15 ×1
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AC power cord ×1
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USB data cable ×2
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Headphone plug adapter ×1
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Remote control ×1
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Fuse ×1
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XLR4 decorative plug ×1
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Battery ×2 (only for China, English, Japan regions)
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Quick start guide ×1
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Warranty card ×1
Specifications
Basic specifications
Color: Black/Silver
Dimensions: About 244.6x213x66.8mm
Weight: About 2100g
Hardware configurations
Master Control: X2000, ESP32-S3
DAC: AK4497S*2
USB: XMOS XU316
Headphone amplifier transistor: MJE243G/253G
Display: 3.93-inch LCD
Decoding specifications
USB DAC: 768kHz/32bit; DSD512 (Native)
Coaxial input: 192kHz/24bit; DSD64
Optical input: 96kHz/24bit
Local playback: 384kHz/32bit; DSD256
Headphone outputs
Output Power 1: L+R≥1400mW+1400mW (32Ω SE, THD+N＜1%, Ultra high gain mode)
Output Power 2: L+R≥3000mW+3000mW (32Ω BAL, THD+N＜1%, Ultra high gain mode)
Output Power 3: L+R≥180mW+180mW (300Ω SE, THD+N＜1%, Ultra high gain mode)
Output Power 4: L+R≥700mW+700mW (300Ω BAL, THD+N＜1%, Ultra high gain mode)
Streaming playback: 384kHz/32bit; DSD256 (DOP)
Line outputs
RCA output: L+R=2.4Vrms+2.4Vrms (1kHz@10kΩ)
XLR output: L+R=4.8Vrms+4.8Vrms (1kHz@10kΩ)
Audio parameters
Frequency response: 20Hz~80kHz, attenuation＜2.8dB
SNR: ≥122dB (A-weighted)
Noise floor: ＜5.3μV (A-weighted)
THD+N: ＜0.00054% (1kHz/-12dB@32Ω)