{"product_id":"fiio-k11-r2r","title":"FiiO K11 R2R | Desktop Headphone DAC and Amp","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-logo.webp?v=1732225693\" alt=\"FiiO logo\" style=\"display: block; margin-left: auto; margin-right: auto; width: 65%;\"\u003e\u003c\/p\u003e\n\u003ch4\u003eExperience Pristine Digital Audio with the FiiO K11 R2R, a Desktop DAC and Headphone Amplifier that Delivers Reference-Level Sound\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eUtilizes a Resistor Ladder DAC, known for its warm, analog sound\u003c\/li\u003e\n\u003cli\u003eDual OPA1642 op-amps deliver ample power to drive demanding headphones\u003c\/li\u003e\n\u003cli\u003eSupports up to 384kHz\/32bit and DSD256\u003c\/li\u003e\n\u003cli\u003eMultiple input options: USB, coaxial, and optical inputs\u003c\/li\u003e\n\u003cli\u003eCompact size and robust aluminum chassis, ideal for desktop setups\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bloomaudio.mom\/blogs\/articles\/fiio-audio-2025-buyers-guide\"\u003eCheck out our FiiO 2025 Buyer's Guide here!\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k11-r2r-banner.webp?v=1732659925\" width=\"2048\" height=\"1200\" alt=\"FiiO K11 R2R dac\/amp sitting on wooden desk with laptop and file organizer\"\u003e\u003c\/p\u003e\n\u003ch3\u003eSpecially Designed Audio Circuit\u003c\/h3\u003e\n\u003cp\u003eThe audio signal is transmitted via a USB interface processor to a digital audio bridge. After being processed by an FPGA, it is sent to the R2R DAC for 4-channel output after decoding. It then passes through two Ti OPA1642 op-amps for low-pass filtering and single-ended analog signal converting, and transmits to the NJW1195A electronic volume control chip for precise volume adjustment. The output stage uses two SGM8262 op-amps for 4-way phase inversion and amplification, resulting in outputs of singed-ended and balanced analog signals.\u003cbr\u003e\u003cbr\u003eThe audio circuit features gain controls. It is complemented by a specially-designed headphone protection circuit and a pop noise elimination system, ensuring the audio circuit is both high quality in sound produced and reliable.\u003c\/p\u003e\n\u003ch3\u003eSpecially Designed Power Supply\u003c\/h3\u003e\n\u003cp\u003eThe K11 R2R uses up to 17 low-noise precision LDO precision regulator IC and 2 DC-DC converters. This provides a multi-channel specialized power supply of 9V, 8V, ±7.5V, ±6V, 5.4V, 3.3V, 1.8V, and 1.2V. These are combined with an external custom 12V switching power supply to ensure the purity of the power supplied and provide a solid foundation for stronger power input.\u003c\/p\u003e\n\u003ch3\u003eTrue 24bit Decoding\u003c\/h3\u003e\n\u003cp\u003eSupport for PCM 384kHz\/24bit and DSD256 decoding, means the K11 R2R can easily handle high-precision audio signals and fully exhibit the details within, providing you with an excellent audio experience. * DSD256 requires setting the DSD output mode to Native on the source device, internally converting to PCM before being decoded by the R2R resistor arrays.\u003c\/p\u003e\n\u003ch3\u003eGain Levels and Volume Curves\u003c\/h3\u003e\n\u003cp\u003eThe K11 R2R has three separate gain levels, each with its own volume curve. This allows a better listening experience with various types of headphones, whether you are using sensitive earphones or hard-to-drive over-ear headphones.\u003c\/p\u003e\n\u003ch3\u003eOne Source of Control\u003c\/h3\u003e\n\u003cp\u003eIn the K11 R2R's minimalist design, the volume knob acts as a crucial source of total control. The K11 R2R's multifunction volume knob is used to power the device on and off, accessing menu operations, making volume adjustment, and other functions.\u003c\/p\u003e\n\u003cp\u003eThe knob is designed so that you can quickly execute various complex actions by simply pressing and turning the knob. You can also quickly switch between LO\/PO modes by double-pressing the knob, making it easier for you to appropriately connect to different headphones or audio setups.\u003c\/p\u003e\n\u003ch3\u003eFully Differential True 24bit R2R DAC Resistor Arrays\u003c\/h3\u003e\n\u003cp\u003eFiiO's newly self-developed four-channel fully differential 24bit R2R DAC consists of two 48 precision thin-film resistor arrays per channel, totaling 192 resistors with 0.1% tolerance and low temperature drift (30ppm). This configuration delivers a unique and charming sound.\u003c\/p\u003e\n\u003ch3\u003eAdditional Features\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDual NOS\/OS Modes\u003c\/strong\u003e\u003cbr\u003eNon-Oversampling Mode: Maintains the original sampling rate for decoding, preserving authentic sound. Oversampling Mode: Upsamples globally to a high sampling rate of 384kHz, for superior audio performance and even more refined sound.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Quality Electronic Volume Control\u003c\/strong\u003e\u003cbr\u003eThe NJW1195A is a 4-channel electronic volume controller. This resistor ladder electronic potentiometer is low distortion and low noise, allowing precise volume adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBeryl Solid Capacitors\u003c\/strong\u003e\u003cbr\u003eThe capacitors' ultra-low ESR, combined with excellent anti-interference capabilities, allow them to provide a stable and clean power supply and this achieve high-quality sound.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePowerful Output\u003c\/strong\u003e\u003cbr\u003eUnder a 32Ω load, the K11 R2R is capable of pushing 1300mW+1300mW under balanced modes. This allows it to easily drive many Hi-Fi headphones and fully unlock their potential.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScreen Full of Clarity\u003c\/strong\u003e\u003cbr\u003eA custom, high-contrast and durable LCD screen allows you to easily see the sampling rate, volume, gain, or output mode with just a glance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePhosphor Copper Metal Shielding\u003c\/strong\u003e\u003cbr\u003eThe shielding cover undergoes a passivation process, providing corrosion resistance and anti-oxidation capabilities. It effectively resists external interference, ensuring signals processed are accurate.\u003c\/p\u003e","brand":"FiiO","offers":[{"title":"Black","offer_id":41196824559691,"sku":"FIO-K11-R2R-BLK","price":175.99,"currency_code":"USD","in_stock":false},{"title":"Silver","offer_id":41157896142923,"sku":"FIO-K11-R2R-SLV","price":175.99,"currency_code":"USD","in_stock":true},{"title":"Silver - Open Box","offer_id":42066646401099,"sku":"FIO-K11-R2R-SLV-OB","price":159.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k11-r2r-blk-0-thumb.webp?v=1735254626","url":"https:\/\/bloomaudio.mom\/products\/fiio-k11-r2r","provider":"Bloom Audio","version":"1.0","type":"link"}