{"product_id":"fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier","title":"FIIO K11 Compact Desktop R2R architecture DAC and Headphone Amplifier","description":"\u003cp\u003eThe FiiO K11 R2R is a compact desktop DAC and headphone amplifier built around FiiO’s own fully differential 24-bit R2R resistor ladder instead of an off-the-shelf DAC chip, for a smooth, rich, organic sound. Switchable NOS and OS modes give two flavours of it. A 6.35mm and a 4.4mm balanced output deliver up to 1,300mW per channel, with three gain levels, USB, optical and coaxial inputs, an RCA line\/pre output and a clear LCD screen. It won Gold Awards in both the Life Style and Pure Audio categories of Japan’s VGP 2025 Summer awards.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier-photo-colours.jpg?v=1791315379\" alt=\"FiiO K11 R2R desktop DAC and headphone amplifiers in black, red and silver\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA true 24-bit, fully differential R2R ladder\u003c\/h3\u003e\n\u003cp\u003eFiiO’s newly developed four-channel R2R DAC uses 2 × 48 precision thin-film resistors per channel, 192 in all, with 0.1% tolerance and low temperature drift (30ppm). Because the design is fully differential, it produces less noise and fewer harmonics than a typical R2R layout, for a darker, quieter background and what FiiO calls a unique and charming sound.\u003c\/p\u003e\n\u003ch3\u003eNOS or OS: two characters in one\u003c\/h3\u003e\n\u003cp\u003eNOS (non-oversampling) mode decodes at the original sample rate, for an authentic, organic and captivating sound. OS (oversampling) mode upsamples everything to 384kHz for more refined, detailed and clear playback. You can switch freely between them to suit the music. Over USB the K11 R2R accepts PCM up to 384kHz\/32-bit and DSD256, decoded at true 24-bit by the ladder; DSD256 needs the source set to native DSD output, and is converted to PCM inside.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/FIIOK11-R2R_695x695_fdddc458-37aa-4943-a30e-6c0b00f4b355.jpg?v=1767203191\" alt=\"Display of the FiiO K11 R2R showing sample rate, volume and input\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eA carefully designed signal path\u003c\/h3\u003e\n\u003cp\u003eAudio from the USB receiver passes through a digital audio bridge and an FPGA to the R2R DAC. Two TI OPA1642 op-amps then filter it and convert it to a single-ended signal, before the NJW1195A volume controller, a four-channel resistor-ladder electronic potentiometer with low noise and distortion, sets the level precisely. Finally, two SGM8262 op-amps invert and amplify it for the single-ended and balanced outputs. A headphone protection circuit, DC protection and pop-noise suppression keep your headphones safe.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier-photo-volumechip.jpg?v=1791315384\" alt=\"The NJW1195A electronic volume control chip in the FiiO K11 R2R\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003e1,300mW per channel, three gains, three volume curves\u003c\/h3\u003e\n\u003cp\u003eInto 32Ω the balanced 4.4mm output delivers 1,300mW + 1,300mW, enough to unlock the potential of many demanding headphones, while three gain levels with their own volume curves suit everything from sensitive in-ear monitors to hard-to-drive over-ears.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e4.4mm balanced\u003c\/th\u003e\n\u003ctd\u003e1,300mW\/ch @ 32Ω · 520mW\/ch @ 16Ω · 220mW\/ch @ 300Ω · \u0026lt;1.5Ω · for 8–350Ω headphones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e6.35mm\u003c\/th\u003e\n\u003ctd\u003e460mW\/ch @ 32Ω · 660mW\/ch @ 16Ω · 50mW\/ch @ 300Ω · \u0026lt;1Ω · for 8–150Ω headphones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRCA line out\u003c\/th\u003e\n\u003ctd\u003e2.7Vrms · SNR ≥115dB · crosstalk ≥111dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eClean power and quality parts\u003c\/h3\u003e\n\u003cp\u003eSeventeen low-noise LDO regulators and two DC-DC converters create dedicated supply rails (−9V, 8V, ±7.5V, ±6V, 5.4V, 3.3V, 1.8V and 1.2V), fed by an external custom 12V switching power supply. Beryl solid capacitors with ultra-low ESR keep the supply stable and clean. A passivated phosphor-copper shielding cover protects the circuits from interference, and thermal silicone gel and the aluminium alloy case carry heat away from the amplifier. The RCA sockets are pressed metal for a solid, durable connection.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier-photo-caps.jpg?v=1791315388\" alt=\"Circuit board of the FiiO K11 R2R with its Beryl solid capacitors\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier-photo-shield.jpg?v=1791315394\" alt=\"Phosphor-copper shielding cover over the FiiO K11 R2R circuit board\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eOne knob, a clear screen and a light that tells you the sample rate\u003c\/h3\u003e\n\u003cp\u003eA single multi-function knob turns the K11 R2R on and off, sets the volume and runs the menus. Double-press it to switch between headphone (PO), preamp (PRE) and line out (LO) modes; each mode remembers its own volume. The high-contrast LCD is always on without burn-in and shows the sample rate, volume, gain and output mode. The RGB FiiO logo also shows the sample rate: cyan for 48kHz and below, yellow above 48kHz and green for DSD. Its brightness, colour and effects are adjustable, and it is lit evenly by six LED strips. A smart power-saving mode drops into low power when no signal arrives for a long time, and wakes when music returns.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier-photo-knob.jpg?v=1791315400\" alt=\"Volume knob and display of the FiiO K11 R2R in black\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDAC\u003c\/th\u003e\n\u003ctd\u003eFiiO four-channel, fully differential 24-bit R2R ladder (192 thin-film resistors, 0.1%) · NOS\/OS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs\u003c\/th\u003e\n\u003ctd\u003eUSB-C (PCM 384kHz\/32-bit, DSD256; driver-free mode) · coaxial (192kHz\/24-bit) · optical (96kHz\/24-bit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutputs\u003c\/th\u003e\n\u003ctd\u003e4.4mm balanced · 6.35mm · RCA line\/pre out · coaxial out (USB input only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier\u003c\/th\u003e\n\u003ctd\u003e2 × TI OPA1642 + NJW1195A volume + 2 × SGM8262 · gain L\/M\/H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePerformance\u003c\/th\u003e\n\u003ctd\u003eSNR ≥115dB · THD+N about 0.025% · 20Hz–50kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChips\u003c\/th\u003e\n\u003ctd\u003eUSB: SA9312L · control: GD32F303RE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd\u003eDC 12V\/2A adapter (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize and weight\u003c\/th\u003e\n\u003ctd\u003e147 × 133 × 32.3mm (with feet) · about 420g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/FIIOK11-R2R_695x516_dcb1bbd4-2d41-4752-8585-45924ebc4c06.jpg?v=1767203198\" alt=\"FiiO K11 R2R in silver with in-ear monitors\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003ch3\u003eGood to know\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThere’s no app control; everything is set from the knob and screen. Firmware updates go over USB.\u003c\/li\u003e\n\u003cli\u003eThe coaxial output only works with the USB input.\u003c\/li\u003e\n\u003cli\u003ePrefer a chip-based DAC? The standard \u003ca href=\"\/products\/fiio-k11-compact-desktop-dac-and-headphone-amplifier\"\u003eFiiO K11\u003c\/a\u003e is the same size. For headphones to pair with it, see the \u003ca href=\"\/products\/fiio-ft1-32-ohm-large-dynamic-driver-headphones-with-solid-wood-cups\"\u003eFiiO FT1\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eIn the box: K11 R2R, 12V power adapter with power cable, USB cable, 6.35mm headphone adapter, quick start guide and warranty card.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"BLACK","offer_id":57117268017539,"sku":"FIIOK11-R2R-BLACK","price":149.99,"currency_code":"GBP","in_stock":true},{"title":"SILVER","offer_id":57117268050307,"sku":"FIIOK11-R2R-SILVER","price":149.99,"currency_code":"GBP","in_stock":true},{"title":"RED","offer_id":57117268083075,"sku":"FIIOK11-R2R-RED","price":149.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/3199\/8339\/files\/img_proxy_893d5b4f-7efe-4447-b2a7-571e908f4604.jpg?v=1767203223","url":"https:\/\/www.advancedmp3players.co.uk\/products\/fiio-k11-compact-desktop-r2r-architecture-dac-and-headphone-amplifier","provider":"amp3","version":"1.0","type":"link"}