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FiiO K15 Desktop DAC and Amplifier: General Specifications

General Specifications

Name/Model	K15	Hardware solution	Main control: X2000; MCU: ESP32-S3; DAC: AK4497S*2; USB decoding: XU316; Bluetooth decoding: QCC5125; AMP: MJE243G/253G discrete transistor current amplification
Working mode	USB DAC mode/Coaxial decoding mode/Optical decoding mode/Line in mode/Balanced in mode/Bluetooth receiving mode/Streaming media receiving mode/Local playback mode
Color	Black/Silver	Weight	About 2100g
Dimensions	About 244.6x213x66.8mm	Volume control	Knob/Touch-on-display/Remote control
MQA	Supports MQA full decoding	Driver-free mode (Switch mode)	Supported
Gain	Ultra high gain mode/Super high gain mode/High gain/Medium gain/Low gain	Touch-on-display	Supported
Display	3.93-inch LCD (240*1020) bezel-less screen	FIIO Link	Supports settings through the app
PEQ	Supports 10-band PEQ (No PEQ processing in line input and balanced input)	Firmware upgrade	SOC firmware: Upgrade through the rear USB-A port; MCU firmware: Upgrade through the rear RS232 port; XMOS firmware: Upgrade through the front or rear USB-C port
WiFi	Supports 2.4G/5G dual-band WiFi	Knob indicator light	Supports customizing color, brightness, supports always-on indication or RGB pulsing
Remote control	Supports IR remote control (only the one included in the accessory)	Screen status indication	Track format, sampling rate, EQ, volume, Network status, Bluetooth codec, Gain
Max. supported sampling rate (PEQ=OFF)	USB decoding: Up to 768kHz/32bit; DSD512 (Native) Coaxial input decoding: Up to 192kHz/24bit; DSD64 Optical input decoding: Up to 96kHz/24bit Streaming decoding: Up to 384kHz/32bit; DSD256 (DOP) Local playback: Up to 384kHz/32bit; DSD256
Adaptive impedance	PO: 8~150Ω, BAL: 8~350Ω
Buttons and Ports	Knob: Power on/off knob1+Analog output level knob1+Gain level knob1+Volume knob with button1+Menu knob with USB port button1 Type-C USB3 (Data transmission port2+RS232 DSP regulating port1) USB-A1 (Data transmission port) Standard 3.5mm port Balanced headphone out: Standard 4.4mm port1+XLR4 balanced port*1 Headphone out: Standard 3.5mm port Digital optical input port: Optical port Digital coaxial input port: RCA port Balanced line output port: XLR3 balanced port Balanced line input port: RCA port Single-ended line output port: RCA port Single-ended line input port: RCA port
Housing grounding terminal	M4 banana port (Can be directly connected to use)	Ethernet port	1000Mbps
Power Supply Parameters	Power supply: AC 100-240V~50/60Hz; DC 12V/≥2.5A (either-or) Battery capacity: N/A

Audio Parameters

Performance and parameters of headphone output (6.35mm out, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)

Parameter	Value	Parameter	Value
Output power 1	L+R≥1400mW+1400mW (16Ω, THD+N <1%)	Output impedance	<1Ω (32Ω)
Output power 2	L+R≥1400mW+1400mW (32Ω, THD+N <1%)	Crosstalk	≥76dB (1kHz@32Ω)
Output power 3	L+R>180mW+180mW (300Ω, THD+N <1%)	THD+N	<0.00054% (1kHz/-12dB@32Ω)
Output power 4	<5.3µV (A-weighted)	SNR	≥122dB (A-weighted)
Frequency response	20Hz~20kHz: attenuation <0.2dB 20Hz~80kHz: attenuation <2.8dB	Peak output voltage	> 20.6Vp-p

Performance and parameters of headphone output (6.35mm out, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode)

Parameter	Value	Parameter	Value
Output power 1	L+R≥1400mW+1400mW (16Ω, THD+N <1%)	Output impedance	<1Ω (32Ω)
Output power 2	L+R≥760mW+760mW (32Ω, THD+N<1%)	Crosstalk	≥76dB (1kHz@32Ω)
Output power 3	L+R≥90mW+90mW (300Ω, THD+N <1%)	THD+N	<0.00058% (1kHz/-10dB@32Ω)
Output power 4	<5.3µV (A-weighted)	SNR	≥119dB (A-weighted)
Frequency response	20Hz~20kHz: attenuation < 0.2dB 20Hz~80kHz: attenuation <2.8dB	Peak output voltage	> 14.6Vp-p

Performance and parameters of single-ended line output (RCA out, USB DAC/Coaxial decoding/Optical decoding)

Parameter	Value	Parameter	Value
THD+N	<0.00071% (1kHz/-11dB@10kΩ)	SNR	≥119dB (A-weighted)
Crosstalk	≥119dB (1kHz@10kΩ)	Output power 4	<2.6µV (A-weighted)
Frequency response	20Hz~20kHz: attenuation < 0.2dB 20Hz~80kHz: attenuation <2.8dB	Line output level	2.4Vrms (1kHz@10kΩ)

Performance and parameters of balanced headphone output (4.4mm/XLR4 out, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)

Parameter	Value	Parameter	Value
Output power 1	L+R≥1400mW+1400mW (16Ω, THD+N <1%)	Output impedance	<1.5Ω (32Ω)
Output power 2	L+R>3000mW+3000mW (32Ω, THD+N<1%)	Crosstalk	≥116dB (1kHz@32Ω)
Output power 3	L+R≥700mW+700mW (300Ω, THD+N <1%)	THD+N	<0.00059% (1kHz/-13dB@32Ω)
Output power 4	<9.5µV (A-weighted)	SNR	≥120dB (A-weighted)
Frequency response	20Hz~20kHz: attenuation < 0.2dB 20Hz~80kHz: attenuation <2.8dB	Peak output voltage	> 41Vp-p

Performance and parameters of balanced headphone output (4.4mm/XLR4 out, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode)

Parameter	Value	Parameter	Value
Output power 1	L+R≥1400mW+1400mW (16Ω, THD+N <1%)	Output impedance	<1.5Ω (32Ω)
Output power 2	L+R>2800mW+2800mW (32Ω, THD+N<1%)	Crosstalk	≥116dB (1kHz@32Ω)
Output power 3	L+R≥350mW+350mW (300Ω, THD+N <1%)	THD+N	<0.00054% (1kHz/-9dB@32Ω)
Output power 4	<9.5µV (A-weighted)	SNR	≥120dB (A-weighted)
Frequency response	20Hz~20kHz: attenuation < 0.2dB 20Hz~80kHz: attenuation <2.8dB	Peak output voltage	> 29Vp-p

Performance and parameters of balanced line output (XLR3, USB DAC/Coaxial decoding/Optical decoding)

Parameter	Value	Parameter	Value
THD+N	<0.00055% (1kHz/-8dB@10ΚΩ)	SNR	≥120dB (A-weighted)
Crosstalk	≥117dB (1kHz@10kΩ)	Output power 4	<3.3µV (A-weighted)
Frequency response	20Hz~20kHz: attenuation < 0.2dB 20Hz~80kHz: attenuation < 2.8dB	Line output level	4.8Vrms (1kHz@10kΩ)

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