FiiO K19 silver
FiiO K19 silver
The innovative, 31-band, high-precision lossless FiiO K19 headphone amplifier features Dual Engine Limiter (DEL) technology. Thanks to proprietary algorithms, it can apply various sound effects like dynamic range compression (DRC) and dynamic range enhancement (DRE), as well as an advanced limiter to prevent clipping. The K19 also features an adjustable 31-band high-precision lossless PEQ*, which supports direct adjustment of audio signals from PCM 44.1k to 192k without needing sample rate conversion (SRC). For each band, the gain can be set within a +12 to -24dB range, and the Q value can be adjusted from 0.4dB to 128dB. You don't have to just use your own PEQ curves – PEQ presets in the K19 can be shared between users. The ability to import and export PEQ presets opens up a new dimension of sound customisation. The clock frequencies are precisely managed, ensuring low jitter in the processed digital signals, which results in a cleaner and clearer sound.
Key features of the FiiO K19 headphone amplifier in silver
- High-end headphone amplifier
- Dual ES9039SPRO DAC chip, dual THX AAA-788+ amplifier chip
- 31-band lossless adjustable equaliser
- Studio-grade flagship DAC, headphone amplifier K19
- 8-channel flagship ESS ES9039SPRO DAC
- Powerful femtosecond crystal oscillator with ultra-low phase noise
- Ultra-thin, shock-resistant die-cast body
- Supports infrared remote control
ADI ADSP-21565 with SHARC+ core
The FiiO K19 headphone amplifier, a desktop DAC and headphone amp, uses an ADI ADSP-21565 DSP chip with a SHARC+ core, complemented by its own femtosecond crystal oscillator with ultra-low phase noise. The DSP chip, with its high 800MHz clock speed and 64-bit double-precision floating-point calculation capabilities, enables the K19's 31-band high-precision lossless PEQ. The ADI DSP chip not only ensures that the audio signals post-PEQ adjustment are high-quality with minimal distortion, but also helps to enable powerful system protection functions that safeguard both the K19 and other devices and headphones connected to it.
A flagship device
Inside the FiiO K19 headphone amplifier, you'll find two 8-channel ESS ES9039SPRO DAC chips, which feature the fourth-generation 32-bit HyperStream architecture and are capable of achieving an ultra-high dynamic range with ultra-low noise. These DAC chips allow the K19 to produce a cleaner, richer sound with an abundance of detail. The K19 features an 8-channel THX AAA 788+ headphone amplifier architecture, operating in parallel and powered by a high-voltage supply. The individual THX chips are connected in parallel in 2×2 groups, creating a fully balanced four-channel amplification system. The result is improved transient response and a high power output of up to 8000mW + 8000mW into a 32Ω load, allowing the K19 to effortlessly power all types of headphones.
ACCUSILICON crystal oscillators
The FiiO K19 headphone amplifier uses two ACCUSILICON AS318-B femtosecond oscillators with ultra-low phase noise (45.1584MHz, 49.1520MHz), which are 100% pre-screened before being selected for use in the K19. The femtosecond crystal oscillators effectively reduce the impact of phase noise on audio signals and enable accurate sound restoration and various sampling rates – resulting in a cleaner and more stable sound, regardless of the source sampling rate.
Fully balanced design
The K19 processes audio signals through a fully differential chain – from the dual DACs, through the I/V converter, low-pass filtering, and finally the balanced headphone amplifier, to ensure high dynamics and minimal crosstalk. Different parts of the audio circuitry, such as the IV, LPF, and preamp, also use multiple precision op-amps, including the OPA2211 and OPA1602, to ensure stable, high-quality sound. The K19 arrives in style, crafted from a die-cast aluminium alloy unibody for a seamless design. The aluminium alloy body is meticulously polished with a multi-axis CNC machine to a quality worthy of a flagship. The aluminium alloy body is not only thinner but also shock-resistant. Combined with the included stand, the K19 is perfectly stable.
Digital processing architecture
The K19 uses a powerful quad-core FPGA as its centre for high-resolution digital signal processing. The FPGA is responsible for processing all incoming digital signals, including Bluetooth reception and decoding, USB decoding, coaxial and optical decoding, HDMI/ARC decoding, and DSP digital signal processing. The digital signals are directly transmitted through two sets of I2S channels to the dual ES9039SPRO DACs, ensuring minimal distortion and loss of audio signals in the digital audio processing chain.
HDMI/ARC decoding support
The FIIO desktop DAC and amplifier feature HDMI IN and ARC functionalities. The K19 supports decoding from the HDMI input, HDMI output, and the HDMI ARC Audio Return Channel feature, which opens the door to a new way of enjoying an immersive audiovisual experience. Decoding/output – HDMI supports sampling rates up to 192kHz/24bit, HDMI ARC supports sampling rates of 44.1/48kHz. The K19's digital and analogue audio circuits are housed on separate boards, ensuring full isolation and significantly reducing interference. The DSP board, DAC board, and THX headphone amplifier board are fitted with metal shields, as the digital board and module board use a separate aluminium alloy construction. All these measures help to minimise crosstalk and ensure signal purity. Furthermore, the honeycomb-structured aluminium alloy body helps to further reduce external interference, allowing you to enjoy pure, crisp music.
Multi-stage analogue power supply
The K19 houses a 40W low-noise, high-efficiency, and long-life industrial-grade power supply. This power supply supports an ultra-wide input voltage range (85–305V AC) and can operate even in extreme temperatures (–40–85°C) with a high reliability of up to 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 to experience a different sound. The K19's analogue audio circuit is powered by a multi-stage power supply. With numerous analogue power stages, there are power management circuits for the digital-to-analogue conversion, LPF, preamp, headphone amplifier, and other audio circuit stages. Each stage uses a large number of precision LDOs to stabilise the secondary voltage, ensuring a continuous clean power supply. Separate power supplies for the digital and analogue audio circuits effectively prevent crosstalk and interference between the two circuits. They also provide better power supply isolation.
** The external DC power supply supports 15V, 3A.
High-energy cooling performance
The K19's internal heat dissipation system consists of a thermally conductive material that is in contact with the internal chips, transferring heat from the chips to the thermal material and ultimately to the outer aluminium alloy frame. The thermally conductive aluminium alloy body also features a honeycomb structure that enables convective heat dissipation. The K19's internal and external heat dissipation systems allow the machine to consistently deliver high performance without the user having to worry about heat issues.
Pure versatility
Use it vertically or horizontally – this saves space and efficiently dissipates heat. When used vertically, it can also serve as a unique headphone stand for even greater convenience. The 1.3-inch full-colour display lets you easily monitor its current status and simplifies making changes. A custom infrared remote control is also included. The K19 allows for convenient switching between operating modes, EQ selection, volume adjustment, and other functions from a distance. The 12V bidirectional trigger supports active/passive control modes and can be linked with another 12V TRIGGER for synchronised device power on and off. The GND/LIFT ground switch reduces crosstalk and interference between devices. It supports the FIIO Control app, enabling convenient adjustment of various USB functions. Dual indicator lights on the volume knob support sample rate indication and various lighting effects***
*** Different lighting effects require a software update of the control app
* PEQ adjustment is supported on Windows and Mac computers, as well as via the mobile control app
Package contents:
Quick start guide, warranty card, AC power cable, Type-C to USB-A adapter, 6.3mm adapter, stand in the main unit's colour, vertical headphone stand in the main unit's colour, screwdriver, metal XLR4 dust cap (pre-installed), feet, screws, USB 2.0 data cable, dual Type-C data cable, 3.5mm audio cable, infrared remote control
Technical specification:
Display indication: volume, gain, output mode, working mode, transmission format, sampling rate, equaliser, etc.
Operating modes: USB decoding (USB interface with a 16-core XMOS XU316 chip enables decoding up to 768kHz/32bit, supports DSD512 and full MQA decoding), Bluetooth input (Qualcomm QCC5125 Bluetooth chip supports aptX HD, aptX Adaptive, and LDAC codecs), optical input (allows receiving an optical signal and using the device as an optical decoder), coaxial input (allows receiving a coaxial signal and using the device as a coaxial decoder), HDMI input (supports audio transmission from devices such as game consoles, Blu-ray players or set-top boxes), HDMI ARC (supports Audio Return Channel from TVs and other devices)
Analogue and digital outputs: PO+PRE OUT (default position; front headphone output + rear audio output (adjustable volume)), PO (audio output from the front headphone jack only (adjustable volume)), PRE OUT (audio output from the rear jacks only (adjustable volume)), LO (audio output from the rear jacks only (fixed-level output)), coaxial (standard RCA connectors, digital output), optical (standard Toslink connectors, digital output)
DAC chip: 2× ES9039SPRO
USB chip: XMOS XU316
Bluetooth chip: QCC5125
Amplifier: 8× THX AAA 788+
Max. sampling rate (USB): 768kHz/32bit
DSD support: up to DSD512 (Native)
Max. coaxial sampling: 192kHz/24bit
Max. optical input sampling: 96kHz/24bit
Max. HDMI sampling: 192kHz/24bit
Power supply: AC 100–240V, 50/60Hz / DC 15V ≥ 3A (one of two options)
Recommended headphone impedance: 8–150 / 8–350 Ω (SE/BAL)
Headphone output power (6.35mm, Ultra High Gain): L+R ≥ 4000mW + 4000mW (16Ω, THD+N < 1%) / L+R ≥ 2300mW + 2300mW (32Ω, THD+N < 1%) / L+R ≥ 270mW + 270mW (300Ω, THD+N < 1%)
Headphone output power (4.4mm, Ultra High Gain): L+R ≥ 4000mW + 4000mW (16Ω, THD+N < 1%) / L +R ≥8000mW+8000mW (32Ω, THD+N < 1%) / L+R ≥ 1100mW + 1100mW (300Ω, THD+N < 1%)
Headphone output power (6.35mm, Super High Gain): L+R ≥ 2400mW + 2400mW (16Ω, THD+N < 1%) / L+R ≥ 1250mW + 1250mW (32Ω, THD+N < 1%) / L+R ≥ 135mW + 135mW (300Ω, THD+N < 1%)
Headphone output power (4.4mm, Super High Gain): L+R ≥ 4000mW + 4000mW (16Ω, THD+N < 1%) / L+R ≥ 5000mW + 5000mW (32Ω, THD+N < 1%)
Single-ended line output power: THD+N < 0.00032% (1kHz/-0.8dB at 10kΩ), crosstalk ≥110dB (1kHz at 10kΩ), SNR (signal-to-noise ratio) ≥ 122dB
Specifications
Power outlet type
Inputs and outputs
Features
Frequency range
Power supply
Connection
Dimensions and weight
| Code: | FIIslze017 |
| Warranty: | 24 months |
| Links: | Producer's Website: |
| Manufacturer information |
S.I.C. spol s r.o., Na Folimance 2155/15 120 00 Praha 2, [email protected], +420 222 505 045 
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