Aimed at audiophiles and music enthusiasts, the high-fidelity FiiO K19, styled in black, is a compact desktop USB DAC and headphone amplifier designed to faithfully reproduce your music when listening to audio from your computer, smartphone/tablet, or other digital music player. The K19 employs two high-resolution ES9039SPRO DACs to deliver rich audio details and a superior performance up to a 768 kHz sampling rate and native DSD512.

Equipped with optical and coaxial digital inputs and outputs, a USB-C port, an RS232 port, dual stereo RCA analog line outputs, three headphone jacks (XLR 4-pin balanced, 4.4mm balanced, and 1/4" unbalanced), and Bluetooth support, the K19 acts as a bridge between your computer, phone, speakers, and headphones, allowing them to work together seamlessly. The elegant chassis can be positioned vertically or horizontally and features a 1.3" color display and an infrared remote control. You can also adjust various functions from your smartphone using the FiiO control app.

For Computers, Mobile Devices, Bluetooth    8-Channel THX AAA 788+ Headphone Amp    Two High-Resolution ES9039SPRO DACs    XMOS XU316 USB Controller    Supports 768 kHz / 32-Bit / DSD512    Coaxial and Optical In/Out    Headphones: 3.5 & 4.4mm, 1/4", XLR 4-Pin    Dual Stereo RCA Outs, XLR Outs    31-Band High-Precision EQ    1.3" Color Display

The K19 features DEL (Dual Engine Limiter) technology, and through proprietary algorithms, it can apply various audio effects such as dynamic range compression (DRC), dynamic range enhancement (DRE), and 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 44.1 to 192 kHz audio signals without resorting to sampling rate conversion (SRC). For each band, the gain can be adjusted between a range of +12 to -24 dB, and the Q value can be adjusted between a range of 0.4 to 128 dB. 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.

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 ultralow phase noise femtosecond crystal oscillator. This DSP chip featuring a high clock frequency of 800 MHz and 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 with minimal distortion, it also helps to enable powerful system protection functions that safeguard the K19, other devices, and headphones connected to it.

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

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 2x2 groups to make up a totally balanced,4-channel amplification system. The results are enhanced transients and high-power (8000mW + 8000mW with a 32-ohm load), allowing the K19 to drive all kinds of headphones with ease.

The K19 employs two industry-leading ACCUSILICON AS318-B ultralow phase noise femtosecond crystal oscillators (45.1584 MHz and 49.1520 MHz), which are 100% prescreened 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. Clocks are properly managed, ensuring digital signals being handled are low-jitter, making for purer and clearer audio.

The K19 comes in a brand-new style—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. This aluminum alloy body not only features reduced thickness, but is also shock resistant. And when paired with the included stand, the K19 is very stable.

HDMI input and ARC capabilities are present in an FiiO desktop DAC and amp for the first time. The K19 supports decoding from HDMI input, HDMI output, and HDMI ARC audio return channel, opening the doors to a new way of experiencing an immersive audiovisual experience. HDMI decoding/output supports up to a 192 kHz / 24-bit sampling rate. HDMI ARC supports 44.1 and 48 kHz sampling rates.

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 headphone amplifier board, as a result of the digital board and module adopting a compartmentalized aluminum alloy isolation design. These measures all help to minimize crosstalk to ensure signal purity. In addition, the honeycomb-mesh aluminum-allow body also helps to further reduce external interference, allowing you to enjoy pure, clear music.

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

Related Questions and Answers

Q: 1. Wil the AKG K533 mkII fit?

A: The AKG K553 MKII will fit in the SLAPPA HardBody Pro Full-Sized Headphone Case.

Q: 2. Is this case good for Hifiman Arya?

A: The SLAPPA HardBody Pro Full-Sized Headphone Case (Dimpled Polyurethane, Black) BH #SLHP07 is compatible with the following headphones below: Allen & Heath Xone 53 Audio Technica ATH-M50x Audio Technica ATH-Pro500MK2 AKG k 845BT AKG K 240 Semi-Open Beyerdynamic Custom One Pro Beyerdynamic DT 770 Bose AE2i Cortex CHP-2500 Denon AH-D2000 Fostex T-50RP Grado SR60i HiFiMan HE Series (400i, 400, 560, 6) JBL 700 Everest Logitech 930 5.1 wireless Marshall Major Headphones Monster Beats Wireless Monster Beats Pro Mr.Speakers Mad Dog ONKYO Maiden Audio On-Ear ED-PH0N3S Pioneer HDJ - 1000 Pioneer HDJ - 2000 Philips Fidelio L1 Polk Audio 4 Shot Playstation Gold Wireless Sennheiser HD 518 Sennheiser HD 650 Sennheiser HD 280 Sennheiser HD 201 Sennheiser HD 598 Sennheiser Urbanite XL Wireless Sennheiser PXC 450 Sony MDR-900 Sony MDR-V6 Sony MDR -V700 Sony MDR-7506 Sony MDR-1RBT Sony MDR-1a Sony PULSE Headset Elite Edition Sony MDR-XB950BT Superlux HD688B Shure SRH-440 Turtle Beach Ear Force 7 V-MODA Crossfade LP

Q: 3. Is it possible to use an equalizer with this amp

A: Unfortunately all current Receiver / Amplifiers no longer offer the option to connect a separate Equalizer like the older Receivers sold years ago. The same will apply to this Yamaha A-S801.

Q: 4. Will this fit Beyerdynamic DT 700 Pro X?

A: Yes, the SLAPPA HardBody Pro Full-Sized Headphone Case (Dimpled Polyurethane, Black) BH #SLHP07 would fit the DT700 Pro X.

Q: 5. I want to connect four 8 ohm speakers to the S-501 and listen to them at the sametime.Am I correct in setting the impedence switch to high? Thanks.

A: No. Set the impedance switch to low. Note the instructions on the back panel.

Q: 6. Is this case good for HD700?

A: Perfect for my HD 650's and exceptional value.

Q: 7. Previous M11 versions included a leather case (as I understand it). The "in the box" section for this new M11S says "clear case". What is this?

A: It comes with a clear plastic case.

Q: 8. Can this device be used (listened to) while it is being charged?

A: The FiiO M11S High-Resolution Portable Music Player BH #FIM11S can be used while in charged.

Q: 9. Will this fit Sony WH-XB900N?

A: Yes, these should be fine for this headphone.

Q: 10. Is this a headphone amp? If not, what is it?

A: The ART HEADTAP - 2 Output Headphone Tap is not definitively a headphone amplifier itself, but rather an individual, passive monitor extension that can be connected to a headphone amp or other amplified source. It's passive circuitry maintains and passes along the impedance of the input signal and even serves as a "through" to output that signal down the chain in addition to its headphone connection.