Innovative, 31-band high-precision lossless PEQ

The K19 features DEL (Dual Engine Limiter) technology, and through proprietary algorithms, the K19 can apply various audio effects such as dynamic range compression (DRC) and dynamic range enhancement (DRE) as well as an advanced limiter to prevent clipping. Also on the K19 is an adjustable 31-band high-precision lossless PEQ*, which supports direct adjustment of PCM 44.1k~192k audio signals without resorting to sampling rate conversion (SRC). For each band, the gain can be adjusted between a range of +12~-24dB and the Q value can be adjusted between a range of 0.4dB~128dB. And the PEQ curves don't have to be used only by you - PEQ presets on the K19 can be shared between users. Being able to import and export PEQ presets opens up a whole new dimension to sound adjustment!
*PEQ adjustment is supported on Windows and Mac computers, as well as with the mobile control app

ADI ADSP-21565 with SHARC+ core

For the first time in an FIIO product, the K19 flagship desktop DAC and headphone amplifier utilizes an ADI ADSP-21565 DSP chip with the SHARC+ core backed by a custom ultra-low phase noise femtosecond crystal oscillator. This DSP chip featuring a high clock frequency of 800MHz and capable of 64-bit double precision floating point calculations is what makes the 31-band high-precision lossless PEQ possible in the K19. The ADI DSP chip not only ensures that audio signals after PEQ adjustment are of high quality and with minimal distortion, it also helps to enable powerful system protection functions that safeguard both the K19 and the other devices and headphones connected to it.

Flagship ESS 8-channel ES9039SPRO*2 DACs

Inside the K19 are two of the new ESS 8-channel ES9039SPRO DAC chips, featuring the fourth generation 32Bit HyperStream architecture and capable of ultra-high dynamic range with ultra-low noise. These DAC chips allow the K19 to output clearer and richer audio with plenty of detail.

FiiO K19 Desktop DAC/Amp Flagship ESS DAC

8-channel THX AAA 788+ headphone amplifier

The K19 features a new headphone amplifier design consisting of an 8-channel THX AAA 788+ headphone amp architecture working together in parallel and backed by a high-voltage power supply. The THX amp chips are connected in parallel via 2×2 groups to make up a totally balanced,4-channel amplification system. The result is enhanced transients, and high-power output up to 8000mW+8000mW with a 320 load allowing the K19 to drive all kinds of headphones with ease.

FiiO K19 Desktop DAC/Amp 8 Channel THX Amp

Dual ACCUSILICON high-performance ultra-low phase noise femtosecond crystal oscillators

The K19 employs two industry-leading ACCUSILICON AS318-B ultra-low phase noise femtosecond crystal oscillators (45.1584MHZ, 49.1520MHZ), which are 100% pre-screened before being selected for use in the K19. These femtosecond crystal oscillators effectively reduce the impact of phase noise on audio signals and allow for accurate audio restoration and different sampling rates - resulting in purer and more stable sound no matter the source sampling rate.

FiiO K19 Desktop DAC/Amp Dual ACCUSILICON

High-quality digital audio processing architecture

For the first time in an FIIO product, the K19 utilizes a powerful quad-core FPGA as a high-definition digital signal processing center. The FPGA is responsible for handling all incoming digital signals, including Bluetooth reception and decoding, USB decoding, coaxial and optical decoding, HDMI/ARC decoding, and DSP digital signal processing. These digital signals are directly transmitted through two sets of 12S channels to the dual ES9039SPRO DACs, ensuring minimal distortion and loss of audio signals in the digital audio processing chain.

FiiO K19 Desktop DAC/Amp Audio Processing Diagram

New flagship, ultra-thin die-cast unibody shock- proof construction

The K19 comes with a brand new styling, made of a die-cast unibody aluminum alloy body for a totally seamless design. The aluminum alloy body is carefully polished by a multi-axis CNC machine to a quality befitting of a flagship. This aluminum alloy body not only features reduced thickness, but is also capably shock-proof. And when paired with the included stand, the K19 is simply stable!

FiiO K19 Desktop DAC/Amp Diecast Shockproof Construction

A new HiFi direction, supports HDMI/ARC

HDMI IN and ARC capabilities are present in an FIIO desktop DAC and amp for the first time. The K19 supports decoding from HDMI2.0 input, HDMI output and HDMI ARC audio return channel functionality, opening the doors to a new way of experiencing an immersive audiovisual experience.

FiiO K19 Desktop DAC/Amp HDMI Arc Support

Separated and shielded circuit boards

The digital and analog audio circuits of the K19 lie on separate boards for full isolation and greatly reduced interference. There are metal shields for the DSP board, DAC board, and the THX head-phone amplifier board, as a result of the digital board and module board adopting a compartmentalized aluminum alloy isolation design. These measures all help to minimize crosstalk to ensure signal purity. In addition, the honeycomb-mesh aluminum alloy body can also help to further reduce external interference, allowing you to enjoy pure, clean music.

FiiO K19 Desktop DAC/Amp Separated and Shielded Circuit Board

Carefully designed power supply

Built into the K19 is a new generation 40W lower-noise, high-efficiency, long-lasting industrial-grad power supply. This power supply supports an ultra-wide range of input voltage (85-305VAC) and can operate under extreme temperatures (-40°C-85°C) with high reliability of around 500000 hours. The K19 can also be used with an external DC power supply*, allowing you to pair it with a high-performance linear power supply, letting you experience a different sound. *External DC power supply supports 15V-3A

Dual internal and external heat dissipation, high energy coolly output

The K19's internal heat dissipation system consists of thermally conductive material being in contact with the chips inside, which transfers the heat from the chips to the thermally conductive material and finally to the aluminum alloy outer frame. In addition, the thermally conductive aluminum alloy body features a honeycomb mesh design, which allows for convection heat dissipation. The internal and external heat dissipation systems of the K19 allow the machine to consistently output high power without the user worrying about heat issues.

FiiO K19 Desktop DAC/Amp Heat Dissipation

Six operating modes

USB decoding: the XMOS 16-core XU316 enables decoding up to 768kHz/32bit, DSD512, MQA full decoding
Optical input: capable of receiving optical input, for use as an optical decoder
Bluetooth input: the Qualcomm QCC5125 enables support for aptX HD/aptX Adaptive/LDAC codecs
Coaxial input: capable of receiving coaxial input, for use as a coaxial decoder
HDMI input: supports audio input from devices such as video game consoles/Blu-ray players/ set-top boxes
HDMI ARC: supports audio return from TVs and other devices

Four analog output + two digital output

PO+PRE OUT (default position): front headphone out+rear audio out (volume adjustable)
PO: audio output only from the front headphone jack (volume adjustable)
PRE OUT: audio output only from the rear connectors (volume adjustable)
LO: audio output only from the rear connectors (fixed level output)
COAXIAL: standard RCA connectors, digital output
OPTICAL: standard toslink connectors, digital output

IN THE BOX

Quick Start Guide
Warranty Card
AC Power Cord
Type-C to USB-A Adapter
6.35mm Adapter
Stand (Color matching with main unit)
Vertical Headphone Stand Support (Color matching with main unit)
Screwdriver
Metal XLR4 Dust Cover (Pre-installed)
Feet Stands
Screws
USB2.0 Data Cable
Dual Type-C Data Cable
3.5mm Audio Cable
Infared Remote Control

SPECIFICATIONS

General specifications
Name/Model No.	K19	Hardware solution	DAC: ES9039SPRO*2; USB: XMOS XU316; Bluetooth decoding: QCC5125; AMP: 8-way THX788+
Working mode	USB DAC mode/Coaxial decoding mode/Optical decoding mode/HDMI decoding mode/HDMI ARC decoding mode/Bluetooth receiving mode
Color	Black/Silver	Weight	About 1800g
Dimensions	About 250x225x36.7mm	Volume control type	Knob/Remote control
MQA	Support MQA global decoding	Drive-free mode (Switch mode)	Surpported
Gain	Ultra high gain/Super high gain/High gain/Medium gain/Low gain	Bluetooth reception (5.1)	SBC/AAC/aptX/aptX LL/aptX HD/atpX Adaptive/LDAC
Display	1.30-inch TFT (240*240) fully laminated screen	Display status indication	Display indication: volume, gain, output mode, working mode, transmission format, sampling rate, EQ, etc.
Bluetooth format indication	Surpported	Sample rate indication	Surpported
FIIO Control	Surpported	Firmware upgrade	System firmware: upgrade through front panel USB interface XMOS firmware: upgrade via front or rear panel USB interface Bluetooth Firmware: Upgrade via FIIO Control
Remote control	Supports infrared remote control (only the delivered remote control is supported)	Sample rate indication (Knob indicator light)	Blue：44.1/48kHz
Maximum supported sampling rate	USB decoding: supports up to 768kHz/32bit; DSD512 (Native)		Yellow：88.2/96/176.4/192/352.8/384/705.6/768kHz
	Coaxial input decoding: supports up to 192kHz/24bit; DSD64		Green：DSD64/128/256/512
	Optical input decoding: supports up to 96kHz/24bit		Magenta：MQA
	Coaxial output: supports up to 192kHz/24bit; DSD64	Bluetooth format indicator (Knob indicator light)	Bule：SBC
	Optical fiber output: supports up to 192kHz/24bit		Cyan：AAC
	HDMI decoding: supports up to 192kHz/24bit		Purple：aptX/aptX LL
	HDMI output: supports up to 192kHz/24bit		Yellow：aptX HD
	HDMI ARC decoding: supports 44.1/48kHz		Green：aptX Adaptive
Adaptation impedance	PO：8~150Ω		White：LDAC
Adaptation impedance	BAL：8~350Ω
Buttons and Interfaces
Buttons	Encoder knob (volume knob with button1+menu knob with button1)	USB interface	Type-C USB (data transmission interface2+RS232 DSP adjustment interface1)
DC power input interface	Φ6.2mm DC socket	Toggle Switches	DC power supply and AC power supply selector switch1+ground selector switch1
Digital optical input interface	fiber optic socket	Digital coaxial input interface	RCA socket
Digital optical output interface	fiber optic socket	Digital coaxial output interface	RCA socket
Balanced output interface	Standard 4.4mm socket1+XLR4 balanced socket1	Headphone output interface	Standard 6.35mm socket
Balanced line output interface	XLR3 balanced socket	Single-ended line output interface	RCA socket*2
HDMI interface	HDMI IN interface1; HDMI OUT(ARC) interface1	TRIGGER interface	Standard 3.5mm headphone jack (TRIGGER IN interface1+TRIGGER OUT interface1)
Power parameters
Power supply	Support AC 100-240V~50/60Hz; DC 15V/≥3A (choose one of the two)	Battery capacity	None
Audio parameters
Some performance parameters of headphone output (6.35mm output, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)
Output power 1	L+R≥4000mW+4000mW（16Ω，THD+N＜1%)	Output impedance	＜0.6Ω（32Ω）
Output power 2	L+R≥2300mW+2300mW（32Ω，THD+N＜1%)	Crosstalk	≥75dB (1kHz@32Ω)
Output power 3	L+R≥270mW+270mW（300Ω ，THD+N＜1%)	THD+N	＜0.0003%(1kHz/-6dB@32Ω)
Noise floor	<3.5μV (A-weighted)	SNR	≥127dB (A-weighted)
Frequency response	20Hz~20kHz: Attenuation <0.2dB 20Hz~80kHz: Attenuation＜3dB	Peak output voltage	＞22.5Vp-p
Some performance parameters of headphone output (6.35mm output, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode)
Output power 1	L+R≥2400mW+2400mW（16Ω，THD+N＜1%)	Output impedance	＜0.6Ω（32Ω）
Output power 2	L+R≥1250mW+1250mW（32Ω，THD+N＜1%)	Crosstalk	≥75dB (1kHz@32Ω)
Output power 3	L+R≥135mW+135mW（300Ω ，THD+N＜1%)	THD+N	＜0.0003%(1kHz/-4dB@32Ω)
Noise floor	<3.5μV (A-weighted)	SNR	≥127dB (A-weighted)
Frequency response	20Hz~20kHz: Attenuation <0.2dB 20Hz~80kHz: Attenuation＜3dB	Peak output voltage	＞17.5Vp-p
Some performance parameters of single-ended line output (RCA output, USB DAC/Coaxial decoding/Optical decoding)
THD+N	＜0.00032%(1kHz/-0.8dB@10kΩ)	SNR	≥122dB (A计权)
Crosstalk	≥110dB (1kHz@10kΩ)	Noise floor	＜1.6μV（A计权）
Frequency response	20Hz~20kHz: Attenuation <0.1dB 20Hz~80kHz: Attenuation＜3dB	Line output level	2.5Vrms (1kHz@10kΩ)
Some performance parameters of balanced headphone output (4.4mm/XLR4 output, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)
Output power 1	L+R≥4000mW+4000mW（16Ω，THD+N＜1%)	Output impedance	＜0.6Ω（32Ω）
Output power 2	L+R≥8000mW+8000mW（32Ω，THD+N＜1%)	Crosstalk	≥120dB (1kHz@32Ω)
Output power 3	L+R≥1100mW+1100mW（300Ω ，THD+N＜1%)	THD+N	＜0.0002%(1kHz/-6dB@32Ω)
Noise floor	<6μV (A-weighted)	SNR	≥128dB (A-weighted)
Frequency response	20Hz~20kHz: Attenuation <0.2dB 20Hz~80kHz: Attenuation＜3dB	Peak output voltage	＞45Vp-p
Some performance parameters of balanced headphone output (4.4mm/XLR4 output, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode)
Output power 1	L+R≥4000mW+4000mW（16Ω，THD+N＜1%)	Output impedance	＜0.6Ω（32Ω）
Output power 2	L+R≥5000mW+5000mW（32Ω，THD+N＜1%)	Crosstalk	≥120dB (1kHz@32Ω)
Output power 3	L+R≥550mW+550mW（300Ω ，THD+N＜1%)	THD+N	＜0.0003%(1kHz/-9dB@32Ω)
Noise floor	<6μV (A-weighted)	SNR	≥126dB (A-weighted)
Frequency response	20Hz~20kHz: Attenuation <0.2dB 20Hz~80kHz: Attenuation＜3dB	Peak output voltage	＞35.8Vp-p
Balanced line output performance parameters (XLR3, USB DAC/Coaxial decoding/Optical decoding)
THD+N	＜0.00025%(1kHz/0dB@10kΩ)	SNR	≥128dB (A-weighted)
Crosstalk	≥120dB (1kHz@10kΩ)	Noise floor	<2.0μV (A-weighted)
Frequency response	20Hz~20kHz: Attenuation <0.1dB 20Hz~80kHz: Attenuation＜3dB	Line output level	4.8Vrms (1kHz@10kΩ)

FiiO K19 Desktop DAC/Amp