{"product_id":"fiio-k11-r2r","title":"FiiO K11 R2R","description":"\u003cp\u003eFiiO K11 R2R is a compact desktop DAC and headphone amplifier for listeners who specifically want an affordable resistor-ladder design rather than the more conventional delta-sigma architecture used in the standard K11.\u003c\/p\u003e\n\u003cp\u003eIts four-channel fully differential 24-bit R2R network uses 192 precision thin-film resistors and offers selectable NOS and OS playback. USB-C, optical and coaxial inputs cover common desktop and television sources, while 6.35mm and 4.4mm headphone outputs plus RCA line and preamplifier modes allow it to serve both headphones and a stereo system.\u003c\/p\u003e\u003ch2\u003eWhy it stands out\u003c\/h2\u003e\n\u003ch3\u003eAffordable true R2R conversion\u003c\/h3\u003e\n\u003cp\u003eFIIO’s four-channel fully differential 24-bit resistor ladder uses 192 precision thin-film resistors, making the K11 R2R a practical entry point for listeners who want to try R2R conversion without buying a separate high-priced DAC.\u003c\/p\u003e\n\u003ch3\u003eNOS and OS modes with clearly different purposes\u003c\/h3\u003e\n\u003cp\u003eNOS sends the signal through the ladder without digital oversampling, while OS upsamples to 384kHz before conversion. The two modes let you compare a more direct R2R presentation with a cleaner, more controlled alternative.\u003c\/p\u003e\n\u003ch3\u003eUseful power across balanced and single-ended headphones\u003c\/h3\u003e\n\u003cp\u003eThe 4.4mm balanced output reaches up to 1300mW + 1300mW at 32Ω, while the 6.35mm output, three gain levels and electronic volume control support a wider range of full-size headphones and earphones.\u003c\/p\u003e\n\u003ch3\u003eCompact DAC, headphone amplifier and preamplifier in one\u003c\/h3\u003e\n\u003cp\u003eUse USB-C, optical or coaxial input, listen through headphones, or switch the RCA output between fixed line level and variable preamplifier mode for an external amplifier or active speakers.\u003c\/p\u003e\u003ch2\u003eBest for\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eListeners who specifically want to try R2R and compare NOS with OS playback\u003c\/li\u003e\n\u003cli\u003eCompact PC or Mac headphone systems using USB-C\u003c\/li\u003e\n\u003cli\u003eTelevision headphone systems using optical PCM output\u003c\/li\u003e\n\u003cli\u003eUsers who want one desktop unit for both headphones and RCA-equipped stereo systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eNot ideal for\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUsers who want Bluetooth reception or wireless-headphone transmission\u003c\/li\u003e\n\u003cli\u003eTurntables, cassette decks or other sources that require an analog input\u003c\/li\u003e\n\u003cli\u003eSystems that require balanced XLR line output\u003c\/li\u003e\n\u003cli\u003eUsers seeking the lowest measured distortion and noise rather than the R2R presentation\u003c\/li\u003e\n\u003cli\u003ePortable use or direct connection to passive speakers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FIIO_K11_R2R_-Product_Overview.jpg?v=1789809872\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FIIO_K11_R2R_-Key_Features.jpg?v=1789809886\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FIIO_K11_R2R-connectivity.jpg?v=1789809901\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FIIO_K11_R2R-Core_Technology.jpg?v=1789809914\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FIIO_K11_R2R-Real-World_Setup.jpg?v=1789809921\" alt=\"\"\u003e\n\u003c\/div\u003e\n\u003ch2\u003eEMiUZEK Buying Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eK11 R2R and the standard K11 are different sound and feature choices, not simple old and new versions. Choose the R2R model for its resistor ladder and NOS\/OS modes; choose the standard K11 if conventional delta-sigma conversion and stronger measured noise and distortion performance matter more.\u003c\/li\u003e\n\u003cli\u003eThere is no Bluetooth or analog input. Phones and computers need USB audio, while televisions and digital transports need compatible optical or coaxial output.\u003c\/li\u003e\n\u003cli\u003eThe highest quoted 1300mW + 1300mW power is from the 4.4mm balanced output at 32Ω. The 6.35mm output has different power figures, so do not compare them as if they were identical.\u003c\/li\u003e\n\u003cli\u003eFor very sensitive earphones, begin with low gain and low volume. Buyers who prioritize the lowest possible noise floor should compare the standard K11 before ordering.\u003c\/li\u003e\n\u003cli\u003eThe rear RCA sockets can provide fixed line output or variable preamplifier output, but there is no balanced XLR line output and passive speakers still require a separate amplifier.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eShould I buy the K11 R2R or the standard K11?\u003c\/h3\u003e\n\u003cp\u003eChoose K11 R2R if the resistor-ladder design, fuller vocal presentation and the ability to switch between NOS and OS are the main reasons for buying. The standard K11 uses a conventional delta-sigma DAC, offers digital-filter choices and has better measured distortion and noise performance. The R2R version is an alternative tuning and architecture, not an automatic upgrade in every area.\u003c\/p\u003e\n\u003ch3\u003eWhat actually changes when I switch between NOS and OS?\u003c\/h3\u003e\n\u003cp\u003eNOS avoids digital oversampling and preserves the direct R2R conversion path; many listeners choose it for a denser, more relaxed presentation. OS upsamples to 384kHz before conversion and generally presents edges and detail more cleanly. The setting does not increase amplifier power, and the preferred mode depends on the headphones and recording.\u003c\/p\u003e\n\u003ch3\u003eWill it drive my headphones, and do I need a 4.4mm cable?\u003c\/h3\u003e\n\u003cp\u003eA 6.35mm headphone can be used normally and does not need to be recabled. The 4.4mm balanced output provides the highest power—up to 1300mW + 1300mW at 32Ω—and is useful for compatible, less sensitive headphones. Choose low, medium or high gain according to headphone sensitivity and start with the volume low.\u003c\/p\u003e\n\u003ch3\u003eIs the K11 R2R suitable for sensitive IEMs?\u003c\/h3\u003e\n\u003cp\u003eIt can be used with IEMs through the 6.35mm output and low gain, but the R2R model does not have the lowest noise figures in the K11 family. Extremely sensitive earphones may reveal more background noise than less sensitive headphones; buyers who consider silence between tracks the top priority should compare the standard K11.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with active speakers or an existing amplifier?\u003c\/h3\u003e\n\u003cp\u003eYes. Connect the rear RCA output to an amplifier or active speakers. Use LO for a fixed-level signal when another device controls volume, or PRE when you want the K11 R2R knob to control the output level. It has no XLR line output and cannot power passive speakers directly.\u003c\/p\u003e\n\u003ch3\u003eCan I connect a television?\u003c\/h3\u003e\n\u003cp\u003eYes, through optical input when the television can output two-channel PCM. If there is no sound, change the TV’s digital-audio setting from Dolby or bitstream to PCM. The K11 R2R does not include HDMI ARC.\u003c\/p\u003e\n\u003ch3\u003eDoes it support Bluetooth or analog input?\u003c\/h3\u003e\n\u003cp\u003eNo. It has no Bluetooth receiver, Bluetooth transmitter or analog audio input. Available sources are USB-C, optical and coaxial digital audio.\u003c\/p\u003e\n\u003ch3\u003eCan the coaxial socket work as a digital output?\u003c\/h3\u003e\n\u003cp\u003eYes, but only when USB is selected as the input. It is not a general-purpose digital pass-through for optical or coaxial input sources.\u003c\/p\u003e\n\u003ch3\u003eDoes it need a driver on Windows, Mac or a game console?\u003c\/h3\u003e\n\u003cp\u003eMac computers normally use USB Audio without an additional driver. Windows users may need FIIO’s USB driver for the highest sample rates and native DSD. UAC 1.0 mode improves compatibility with devices that do not support UAC 2.0, although the available formats may be reduced.\u003c\/p\u003e\u003ch2\u003eHOW TO CONNECT\u003c\/h2\u003e\n\u003ch3\u003eComputer and wired headphones\u003c\/h3\u003e\n\u003cp\u003eSource icon: Computer\u003cbr\u003eSource: PC \/ Mac\u003cbr\u003eConnection: USB-C\u003cbr\u003eOutput connection: Headphone output\u003cbr\u003eTarget icon: Headphones\u003cbr\u003eOutput: 6.35mm \/ 4.4mm\u003c\/p\u003e\n\u003cp\u003eNote: Select USB input, choose low, medium or high gain for the headphones, and begin with the volume low.\u003c\/p\u003e\n\u003ch3\u003eTV and wired headphones\u003c\/h3\u003e\n\u003cp\u003eSource icon: TV\u003cbr\u003eSource: Television\u003cbr\u003eConnection: Optical\u003cbr\u003eOutput connection: Headphone output\u003cbr\u003eTarget icon: Headphones\u003cbr\u003eOutput: 6.35mm \/ 4.4mm\u003c\/p\u003e\n\u003cp\u003eNote: Set the television’s digital-audio output to two-channel PCM; Dolby or bitstream output may produce no sound.\u003c\/p\u003e\n\u003ch3\u003eDigital source to amplifier or active speakers\u003c\/h3\u003e\n\u003cp\u003eSource icon: Streaming Service\u003cbr\u003eSource: Computer \/ digital transport\u003cbr\u003eConnection: USB-C \/ optical \/ coaxial\u003cbr\u003eOutput connection: RCA LO \/ PRE\u003cbr\u003eTarget icon: Amplifier\u003cbr\u003eOutput: Amplifier \/ active speakers\u003c\/p\u003e\n\u003cp\u003eNote: Use LO when the receiving device controls volume, or PRE when the K11 R2R controls volume. Passive speakers require an amplifier.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eDesktop DAC and headphone amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDAC architecture\u003c\/td\u003e\n\u003ctd\u003eFiiO-developed four-channel fully differential 24-bit R2R resistor array\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistor network\u003c\/td\u003e\n\u003ctd\u003e192 precision thin-film resistors, 0.1% tolerance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating modes\u003c\/td\u003e\n\u003ctd\u003eNOS \/ OS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem controller\u003c\/td\u003e\n\u003ctd\u003eGD32F303RE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB receiver\u003c\/td\u003e\n\u003ctd\u003eSA9312L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier stage\u003c\/td\u003e\n\u003ctd\u003e2 × SGM8262\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume control\u003c\/td\u003e\n\u003ctd\u003eNJW1195A electronic volume controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB-C decoding\u003c\/td\u003e\n\u003ctd\u003ePCM up to 384kHz\/32-bit; native DSD256\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical decoding\u003c\/td\u003e\n\u003ctd\u003ePCM up to 96kHz\/24-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoaxial input decoding\u003c\/td\u003e\n\u003ctd\u003ePCM up to 192kHz\/24-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB Audio modes\u003c\/td\u003e\n\u003ctd\u003eUAC 1.0 \/ UAC 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoaxial digital output\u003c\/td\u003e\n\u003ctd\u003eAvailable only when USB is selected as the input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital inputs\u003c\/td\u003e\n\u003ctd\u003eUSB-C, Toslink optical, coaxial RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeadphone outputs\u003c\/td\u003e\n\u003ctd\u003e6.35mm single-ended; 4.4mm balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog line output\u003c\/td\u003e\n\u003ctd\u003eStereo RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput modes\u003c\/td\u003e\n\u003ctd\u003ePO: headphone output; PRE: variable RCA; LO: fixed-level RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6.35mm output power\u003c\/td\u003e\n\u003ctd\u003e≥660mW + 660mW at 16Ω; ≥460mW + 460mW at 32Ω; ≥50mW + 50mW at 300Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput impedance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6.35mm SNR \/ noise floor\u003c\/td\u003e\n\u003ctd\u003e≥115dB A-weighted \/ \u0026lt;7.2μV A-weighted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6.35mm performance\u003c\/td\u003e\n\u003ctd\u003eTHD+N approx. 0.025%; dynamic range ≥107dB; crosstalk ≥72dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.4mm balanced output power\u003c\/td\u003e\n\u003ctd\u003e≥520mW + 520mW at 16Ω; ≥1300mW + 1300mW at 32Ω; ≥220mW + 220mW at 300Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput impedance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1.5Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.4mm SNR \/ noise floor\u003c\/td\u003e\n\u003ctd\u003e≥115dB A-weighted \/ \u0026lt;14.1μV A-weighted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.4mm performance\u003c\/td\u003e\n\u003ctd\u003eTHD+N approx. 0.025%; dynamic range ≥107dB; crosstalk ≥107dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRCA line output level\u003c\/td\u003e\n\u003ctd\u003e2.7Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRCA SNR \/ noise floor\u003c\/td\u003e\n\u003ctd\u003e≥115dB A-weighted \/ \u0026lt;5.1μV A-weighted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRCA performance\u003c\/td\u003e\n\u003ctd\u003eTHD+N approx. 0.025% at 1kHz\/10kΩ; dynamic range ≥107dB; crosstalk ≥111dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower input\u003c\/td\u003e\n\u003ctd\u003eDC 12V \/ 2A; no internal battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e147 × 133 × 32.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 420g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat's in the box, manuals and downloads\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFiiO K11 R2R ×1\u003c\/li\u003e\n\u003cli\u003ePower Adapter ×1\u003c\/li\u003e\n\u003cli\u003ePower Cable ×1\u003c\/li\u003e\n\u003cli\u003eUSB Data Cable ×1\u003c\/li\u003e\n\u003cli\u003e6.35mm Headphone Adapter ×1\u003c\/li\u003e\n\u003cli\u003eQuick Start Guide ×1\u003c\/li\u003e\n\u003cli\u003eWarranty Card ×1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/emiuzek.com\/pages\/download\"\u003eVisit the EMiUZEK download center.\u003c\/a\u003e\u003c\/p\u003e","brand":"Fiio","offers":[{"title":"Black \/ US","offer_id":43683683631197,"sku":"FiiO-K11-R2R-Black-US","price":710.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ EU","offer_id":43683683663965,"sku":"FiiO-K11-R2R-Black-EU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ AU","offer_id":43722965057629,"sku":"FiiO-K11-R2R-Black-AU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ UK","offer_id":43722965090397,"sku":"FiiO-K11-R2R-Black-UK","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Titanium \/ US","offer_id":43683683500125,"sku":"FiiO-K11-R2R-Titanium-US","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Titanium \/ EU","offer_id":43683683532893,"sku":"FiiO-K11-R2R-Titanium-EU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Titanium \/ AU","offer_id":43722964926557,"sku":"FiiO-K11-R2R-Titanium-AU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Titanium \/ UK","offer_id":43722964959325,"sku":"FiiO-K11-R2R-Titanium-UK","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Silver \/ US","offer_id":43683683565661,"sku":"FiiO-K11-R2R-Silver-US","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Silver \/ EU","offer_id":43683683598429,"sku":"FiiO-K11-R2R-Silver-EU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Silver \/ AU","offer_id":43722964992093,"sku":"FiiO-K11-R2R-Silver-AU","price":896.0,"currency_code":"BRL","in_stock":true},{"title":"Silver \/ UK","offer_id":43722965024861,"sku":"FiiO-K11-R2R-Silver-UK","price":896.0,"currency_code":"BRL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FiiO_K11_R2R_8d65dcea-e833-4078-bcd1-aa44faa1ddb1.webp?v=1785124750","url":"https:\/\/emiuzek.com\/pt-br\/products\/fiio-k11-r2r","provider":"EMiUZEK","version":"1.0","type":"link"}