{"product_id":"fiio-k9-pro-ess","title":"FiiO K9 Pro ESS | Desktop Bluetooth DAC and Amp","description":"\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto; width: 65%;\" alt=\"FiiO logo\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-logo.webp?v=1732225693\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"bloom-discontinued\"\u003e\n\u003ctable width=\"90%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan style=\"color: #a30e0b;\"\u003e\u003cstrong\u003e**DISCONTINUED:\u003c\/strong\u003e\u003c\/span\u003e FiiO's K9 Pro ESS Desktop Bluetooth DAC and Amp is sold out and discontinued. Check out the \u003ca href=\"https:\/\/bloomaudio.mom\/collections\/fiio\/products\/fiio-k15\" title=\"FiiO K15 DAC and Amp\"\u003eFiiO K15 Desktop DAC and Amp\u003c\/a\u003e!\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch4\u003eIntroducing the FiiO K9 Pro ESS, a High-Performance Bluetooth DAC and Amp Boasting Pure, Clean Sound\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDual \u003ca rel=\"noopener\" href=\"https:\/\/www.esstech.com\/wp-content\/uploads\/2022\/09\/ES9038PRO-Datasheet-v3.7.pdf\" target=\"_blank\"\u003eES9038PRO DACs\u003c\/a\u003e ensure high-precision audio decoding with ultra-low distortion\u003c\/li\u003e\n\u003cli\u003eDesigned for home audio setups (Desktop USB audio + active speakers)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSupports MQA decoding and Bluetooth LDAC for studio-quality audio\u003c\/li\u003e\n\u003cli\u003eOffers fully balanced circuitry for superior sound quality and separation\u003c\/li\u003e\n\u003cli\u003eVersatile Connectivity: Includes USB, Bluetooth, optical, coaxial, and balanced inputs\/outputs\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bloomaudio.mom\/blogs\/articles\/fiio-audio-2025-buyers-guide\"\u003eCheck out our FiiO Buyer's Guide here!\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg alt=\"FiiO K9 Pro ESS dac\/amp birds eye view sitting on circular platform with dark background\" height=\"1200\" width=\"2048\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k9-ess-pro-lifestyle.webp?v=1732567762\"\u003e\u003c\/p\u003e\n\u003ch3\u003eK9 Pro ESS\u003c\/h3\u003e\n\u003cp\u003eInside the K9 Pro ESS are two ES9038PRO DAC chips, specifically designed for maximum performance in desktop-grade equipment. One ES9038PRO chip, with all its 8 parallel outputs, is used for each channel to achieve richly detailed sound with minimal distortion.\u003c\/p\u003e\n\u003ch3\u003ePure, Clean Sound\u003c\/h3\u003e\n\u003cp\u003eThe THX AAA 788+ chips used in the K9 Pro ESS provide exemplary details and dynamics no matter if you are using low or high-impedance headphones. The K9 Pro ESS can produce 1100mW under a 300-ohm load and 2100mW under a 32-ohm load undistorted, and 50% higher than the original THX AAA 788 amplifier chips.\u003c\/p\u003e\n\u003ch3\u003ePrecision Design\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFully Differential, Fully Balanced\u003c\/strong\u003e\u003cbr\u003eFully differential signals go through the DAC, volume adjustment, and amp for a truly balanced design. Such a design ensures minimal interference between different components in order to fully maintain all details and large dynamic swings in music for unmatched sound quality.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeparated Analog and Digital Sections\u003c\/strong\u003e\u003cbr\u003eThe PCB of the K9 Pro ESS uses a partitioned layout, where the power supply and signals are not only separated, but the analog signal loop is also put in an independent section guaranteeing the integrity of the audio signal being processed.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSix-Stage Audio Circuit\u003c\/strong\u003e\u003cbr\u003eEvery audio signal goes through a mammoth 6-stage circuit to reproduce music as faithfully and as detailed as possible.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"FiiO K9 Pro ESS front right corner 3 quarter angle on dark background\" height=\"1200\" width=\"2048\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k9-pro-ess-lifestyle-two.webp?v=1732568218\"\u003e\u003c\/p\u003e\n\u003ch3\u003eRobust Power Supply\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eLinear Power Supply\u003c\/strong\u003e\u003cbr\u003eElectricity is the mother of sound, so special attention was paid to optimizing the K9 Pro ESS's power supply to ensure excellent sound. The K9 Pro ESS's linear power supply—with its low-frequency transformer and four massive 4700uF capacitors—makes sure that the rest of the system gets abundant clean power.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIsolated Digital and Analog Power Delivery\u003c\/strong\u003e\u003cbr\u003eThe digital portions of the K9 Pro ESS physically receive power separately from the analog portions for effective shielding against audio interference between the two circuits. This ensures pure and faithful reproduction of your music.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLDOs for Each Circuit Stage\u003c\/strong\u003e\u003cbr\u003eBesides the special high-performance linear power supply, the power stabilization and filtering within the audio circuit is also a big contributor to the K9 Pro ESS's excellent sound. Specifically, in each stage of the audio circuit, ultra-low-noise LDOs are employed for voltage regulation.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003ePrecision Clock Management\u003c\/h3\u003e\n\u003cp\u003eA dual-mode clock management design is utilized for the K9 Pro ESS. Under USB and Bluetooth decoding, dual asynchronous femtosecond clocks are used, while under optical and coaxial decoding, automatic PLL clocks are employed. A more precise clock management system makes it easier to handle any kind of source and maintain the maximum quality possible.\u003c\/p\u003e\n\u003ch3\u003eMQA Renderer, Lossless Sound Reproduction\u003c\/h3\u003e\n\u003cp\u003eThe K9 Pro ESS supports the unfolding of MQA tracks, allowing you to listen to high-resolution audio files that are not only reasonably sized, but also retain master-level sound quality that bring you directly into the recording studio.\u003c\/p\u003e\n\u003ch3\u003eHi-Res Bluetooth\u003c\/h3\u003e\n\u003cp\u003eThe K9 Pro ESS employs the Qualcomm QCC5124 chip to handle Bluetooth duties, with support for formats such as LDAC, aptX HD, and aptX Adaptive. This chip ensures that Bluetooth connections are both reliable and quick, satisfying both the low latency needs for games\/videos and the high bitrate necessary for high-resolution audio.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"FiiO K9 Pro ESS volume knob closeup\" height=\"1200\" width=\"2048\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k9-ess-pro-volume.webp?v=1732567648\"\u003e\u003c\/p\u003e\n\u003ch3\u003eVolume Control\u003c\/h3\u003e\n\u003cp\u003eAdjusting the volume may look like a simple concept, but a good execution of it is crucial to an excellent audio experience. The ADC curve reconstruction method of volume adjustment used in the K9 Pro ESS effectively minimizes any left-right channel volume imbalance and noise. It also results in a smooth change of volume across all levels. This attention paid to the simple process of volume adjustment is just another layer to making sure you truly savor your music with the K9 Pro ESS.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe RGB indicator lights surrounding the volume knob light up differently depending on the currently playing sample rate.\u003c\/p\u003e\n\u003ch3\u003eThree Gain Levels\u003c\/h3\u003e\n\u003cp\u003eChoose between high, medium, and low with a physical switch to fit your needs when listening to your particular pair of headphones. Thanks to the pure hardware gain circuit, even when listening at low gain with high-sensitivity headphones both dynamic range and musical fidelity remain un-compromised.\u003c\/p\u003e\n\u003ch3\u003eCustom Stand\u003c\/h3\u003e\n\u003cp\u003eThe included custom stand not only reduces the amount of space the K9 Pro ESS takes on your desktop, it also allows for more efficient dissipation of heat through convection, making the stand a true example of both form and function.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e AC + built-in Linear Power Supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Input Interface:\u003c\/strong\u003e USB, Optical, Coaxial, Bluetooth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Input Interface:\u003c\/strong\u003e RCA, 4.4mm BAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB Interface:\u003c\/strong\u003e USB-C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eBAL XLR + 4.4mm\u003c\/li\u003e\n\u003cli\u003eSE 6.35mm + 3.5mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Out:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eRCA\u003c\/li\u003e\n\u003cli\u003eBAL XLR\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Processing Layers:\u003c\/strong\u003e 6 layers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClock Design:\u003c\/strong\u003e Dual mode dual crystal oscillator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB Chip:\u003c\/strong\u003e XMOS XUF208\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMQA: \u003c\/strong\u003eRenderer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth:\u003c\/strong\u003e QCC5124\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Clock:\u003c\/strong\u003e High precision PLL + dual crystal oscillator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDAC: \u003c\/strong\u003e(2x) ES9039PRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Mode:\u003c\/strong\u003e HP\/LO\/DAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmp Chip:\u003c\/strong\u003e Dual THX AAA 788+\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Power (PO)\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e2100mW(32 Ω),281mW(300 Ω)\u003c\/li\u003e\n\u003cli\u003eBalance: 2100mW(32 Ω),1100mW(300 Ω)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Power (BAL)\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e2100mW (32Ω)\u003c\/li\u003e\n\u003cli\u003e1100mW (300Ω)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Output Voltage:\u003c\/strong\u003e 52Vpp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD+N:\u003c\/strong\u003e ≤ 0.00025%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSNR:\u003c\/strong\u003e ≥ 129dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPP Control:\u003c\/strong\u003e Android\/iOS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 8\" x 9\" x 3\" (excluding feet)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum alloy\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FiiO","offers":[{"title":"Default Title","offer_id":41157879169099,"sku":"FIO-K9-PRO-ESS","price":499.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fiio-k9-ess-pro-thumb-one.webp?v=1732567648","url":"https:\/\/bloomaudio.mom\/products\/fiio-k9-pro-ess","provider":"Bloom Audio","version":"1.0","type":"link"}