{"product_id":"used-open-box-fiio-k9-pro-ess-desktop-dac-amp","title":"Used \/ Open-Box FiiO K9 Pro ESS Desktop DAC\/AMP","description":"\u003csection\u003e\n\u003ch2\u003eProduct overview\u003c\/h2\u003e\n\u003cp\u003eThe FiiO K9 Pro ESS is a Desktop DAC\/AMP for connecting digital sources to headphones or compact audio systems. HiFiLoop uses this page as a focused model page for used \/ open-box private-quote requests.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesktop DAC and headphone amplifier for USB, coaxial, optical, Bluetooth, and analog line input systems.\u003c\/li\u003e\n\u003cli\u003eDual ESS ES9038PRO DAC architecture and THX AAA 788+ amplification support desktop-grade headphone use.\u003c\/li\u003e\n\u003cli\u003eTruly balanced signal path with 4.4mm and XLR4 balanced headphone outputs plus 6.35mm single-ended output.\u003c\/li\u003e\n\u003cli\u003eQCC5124 Bluetooth reception supports AAC, SBC, aptX family codecs, LDAC, and aptX Adaptive.\u003c\/li\u003e\n\u003cli\u003eRCA and XLR line outputs support active speakers, amplifiers, and compact desktop systems.\u003c\/li\u003e\n\u003cli\u003eFIIO Control support, dual femtosecond clocks, MQA renderer support, and dual-voltage linear transformer support flexible operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct type\u003c\/th\u003e\n\u003ctd\u003eDesktop DAC\/AMP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDAC architecture\u003c\/th\u003e\n\u003ctd\u003eDual ESS ES9038PRO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUSB \/ Bluetooth\u003c\/th\u003e\n\u003ctd\u003eXMOS XUF208 USB; QCC5124 Bluetooth reception\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier\u003c\/th\u003e\n\u003ctd\u003eTHX AAA 788+ x2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLPF \/ volume\u003c\/th\u003e\n\u003ctd\u003eOPA1612 x2; NJU72315 x2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupported formats\u003c\/th\u003e\n\u003ctd\u003eUSB DAC up to 384kHz \/ 32-bit and DSD256; coaxial up to 192kHz \/ 24-bit; optical up to 96kHz \/ 24-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutputs\u003c\/th\u003e\n\u003ctd\u003e6.35mm headphone, 4.4mm balanced headphone, XLR4 balanced headphone, RCA line, XLR3 balanced line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone impedance\u003c\/th\u003e\n\u003ctd\u003eRecommended 16-600 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBalanced output power\u003c\/th\u003e\n\u003ctd\u003eUp to 2.1W at 32 ohms and 1.1W at 300 ohms, THD+N \u0026lt; 1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions \/ weight\u003c\/th\u003e\n\u003ctd\u003eAbout 200 x 224.5 x 72 mm excluding feet; about 2750 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eSeries \/ category notes\u003c\/h2\u003e\n\u003cp\u003eThe K9 Pro ESS sits in the FiiO K Series and fits the Desktop audio converters and amplifiers category, making it relevant for buyers comparing Desktop DAC\/AMP options in similar listening setups.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eCondition \u0026amp; availability\u003c\/h2\u003e\n\u003cp\u003eReference page only. Manual availability check required.\u003c\/p\u003e\n\u003cp\u003eThis is a used \/ open-box reference listing.\u003c\/p\u003e\n\u003cp\u003eFinal pricing, condition, accessories, and availability are confirmed case by case.\u003c\/p\u003e\n\u003cp\u003eReference price is for price context only. Availability and final quote are confirmed manually before payment. New or like-new options can be checked on request.\u003c\/p\u003e\n\u003cp\u003eFor this Desktop DAC\/AMP unit, HiFiLoop checks functional status, cosmetic condition, included accessories, version details, photos, and known limitations before quoting. Where relevant, battery behavior, charging, controls, ports, and connectivity are reviewed for the specific unit being offered.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eShipping \u0026amp; support\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e3–5 business days processing after confirmation\u003c\/li\u003e\n\u003cli\u003e7–15 days typical international shipping\u003c\/li\u003e\n\u003cli\u003eFree shipping over $199\u003c\/li\u003e\n\u003cli\u003e14-day DOA support\u003c\/li\u003e\n\u003cli\u003eRepair path from day 15 to day 180\u003c\/li\u003e\n\u003cli\u003eBuyer may be responsible for return shipping, taxes, and duties\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWhat does Reference price mean?\u003c\/h3\u003e\n\u003cp\u003eReference price is for price context only. It is a planning guide, not a final selling price. Final terms are confirmed with the exact unit.\u003c\/p\u003e\n\u003ch3\u003eIs this exact unit ready to ship?\u003c\/h3\u003e\n\u003cp\u003eManual availability check required. This page identifies the model, not a guaranteed ready-to-ship unit. Timing is confirmed during the quote process.\u003c\/p\u003e\n\u003ch3\u003eCan HiFiLoop help me find another unit?\u003c\/h3\u003e\n\u003cp\u003eYes. New or like-new options can be checked on request. Share your preferred condition, accessories, budget range, and region so HiFiLoop can look for another suitable used \/ open-box option.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"FiiO","offers":[{"title":"Default Title","offer_id":48313318080726,"sku":null,"price":379.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7445\/9862\/files\/SKU__1_k9PROESS.jpg?v=1780368623","url":"https:\/\/www.hifiloop.com\/products\/used-open-box-fiio-k9-pro-ess-desktop-dac-amp","provider":"HiFiLoop","version":"1.0","type":"link"}