{"title":"Wired IEMs","description":"\u003c!-- HiFiLoop | Wired IEMs Collection Description | Final (Conversion-Friendly + High-Trust, Hardcore IEM Focus) --\u003e\u003c!-- HELP ME FIND GEAR = 帮我找设备 \/ 代客寻货 --\u003e\u003c!-- MAKE AN OFFER = 立即出价 \/ 私聊议价 --\u003e\n\u003cdiv class=\"hfl-collection hfl-iems-earphones hfl-wired-iems\"\u003e\n\u003cp class=\"hfl-lede\"\u003e\u003cstrong\u003eThe HiFiLoop Wired IEMs Archive\u003c\/strong\u003e indexes audiophile \u003cstrong\u003ewired\u003c\/strong\u003e in-ear monitors—\u003cstrong\u003eused\u003c\/strong\u003e, \u003cstrong\u003eopen-box\u003c\/strong\u003e, and occasional rare inventory—published with unit-specific notes on \u003cstrong\u003efit\/insertion\u003c\/strong\u003e, \u003cstrong\u003etips\/nozzles\u003c\/strong\u003e, \u003cstrong\u003efilter airflow integrity\u003c\/strong\u003e, \u003cstrong\u003esource matching (impedance sensitivity)\u003c\/strong\u003e, and \u003cstrong\u003econnector \/ revision\u003c\/strong\u003e cues \u003cem\u003ewhen identifiable\u003c\/em\u003e.\u003c\/p\u003e\n\u003cp class=\"hfl-ctas\"\u003eIf a page shows \u003cstrong\u003eSold Out\u003c\/strong\u003e, use \u003ca href=\"#\" class=\"hfl-cta-link\" data-hfl-chat=\"find_gear\" title=\"Request sourcing by connector (2-pin\/MMCX), nozzle\/tip fit, filter\/airflow condition, source matching (impedance sensitivity), and tonal target\"\u003e\u003cstrong\u003eHELP ME FIND GEAR\u003c\/strong\u003e\u003c\/a\u003e. For active listings, use \u003ca href=\"#\" class=\"hfl-cta-link\" data-hfl-chat=\"make_offer\" title=\"Request a private offer on an active listing\"\u003e\u003cstrong\u003eMAKE AN OFFER\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv aria-hidden=\"true\" class=\"hfl-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2 class=\"hfl-h2\"\u003eBrowse by Format\u003c\/h2\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003ca href=\"\/th\/collections\/iems-earphones\" title=\"IEMs \u0026amp; Earphones Collection\"\u003e\u003cstrong\u003eIEMs \u0026amp; Earphones\u003c\/strong\u003e\u003c\/a\u003e \u003cspan class=\"hfl-muted\"\u003e— the full archive index (wired + earbuds + TWS).\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/th\/collections\/earbuds\" title=\"Earbuds Collection\"\u003e\u003cstrong\u003eEarbuds\u003c\/strong\u003e\u003c\/a\u003e \u003cspan class=\"hfl-muted\"\u003e— open-fit presentation; more position-driven than seal-driven.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/th\/collections\/wireless-tws\" title=\"Wireless \/ TWS Collection\"\u003e\u003cstrong\u003eWireless (TWS)\u003c\/strong\u003e\u003c\/a\u003e \u003cspan class=\"hfl-muted\"\u003e— convenience-first daily drivers; codec\/ANC behavior and tuning discipline.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv aria-hidden=\"true\" class=\"hfl-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c!-- Accordion (Short Set: 6) --\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eFit \u0026amp; Insertion Depth (The Real Tuning Lever)\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eWired IEMs are highly sensitive to \u003cstrong\u003einsertion depth\u003c\/strong\u003e, nozzle position, and ear-canal geometry. Small changes can shift upper-mids\/treble perception and stage focus. If you’re sensitive to shout, sibilance, or pressure build-up, tell us—fit constraints narrow the shortlist fast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eTips, Nozzles \u0026amp; Filters (Airflow = Level Consistency)\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eTips and nozzles are acoustic interfaces. Bore size and material can shift tonal center and perceived speed. Many IEMs rely on \u003cstrong\u003efilter mesh\u003c\/strong\u003e to shape the upper range.\u003c\/p\u003e\n\u003cp class=\"hfl-muted\"\u003e\u003cstrong\u003eClogged filter mesh is a common “false imbalance” cause\u003c\/strong\u003e (one side quieter) due to airflow restriction—not necessarily driver failure. Where accessible and safe to verify, we screen \u003cstrong\u003efilter integrity \u0026amp; airflow consistency\u003c\/strong\u003e and disclose notable conditions at the listing level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eSource Matching (Hiss + Impedance Sensitivity \/ FR Shift)\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eBeyond hiss, the audiophile issue is \u003cstrong\u003eimpedance sensitivity\u003c\/strong\u003e: output impedance and damping behavior can create a \u003cstrong\u003efrequency response shift\u003c\/strong\u003e, especially on multi-driver designs. Share your source\/DAP\/DAC\/amp and output type—we’ll steer you toward stable matches.\u003c\/p\u003e\n\u003cp class=\"hfl-muted\"\u003eIf you already own a “problem IEM” that changes dramatically across sources, mention it—we’ll match accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eConnectors, Termination \u0026amp; Cable Condition\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eWe document connector standards (\u003cstrong\u003e2-pin\u003c\/strong\u003e, \u003cstrong\u003eMMCX\u003c\/strong\u003e, proprietary) and terminations (3.5\/2.5\/4.4) when identifiable to avoid ecosystem surprises.\u003c\/p\u003e\n\u003cp class=\"hfl-muted\"\u003e\u003cstrong\u003eCable sheath condition\u003c\/strong\u003e is noted when relevant (no stiffening \/ no oxidation discoloration observed unless disclosed) because it affects ownership experience and resale confidence—even if sound is unaffected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eThe HiFiLoop Bench-Test Protocol\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003e\u003cstrong\u003eThe HiFiLoop Bench-Test Protocol\u003c\/strong\u003e indicates a failure-focused review before publishing, typically including:\u003c\/p\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel Balance \u0026amp; Phase Integrity:\u003c\/strong\u003e obvious balance\/polarity anomalies screened where detectable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter \/ Airflow Screening:\u003c\/strong\u003e nozzle\/filter mesh checked for clog-related level shifts where accessible and safe to verify.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Integrity:\u003c\/strong\u003e connector stability and termination condition noted when applicable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessories \u0026amp; configuration:\u003c\/strong\u003e what’s included is confirmed against the listing (tips\/filters\/cables\/adapters\/case\/box where applicable).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"hfl-muted\"\u003eIf you’re targeting a specific revision\/era or accessory pack, ask—we’ll confirm what we can upfront.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails data-hfl-acc=\"\" class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eSanitization Protocol (Skin-Contact Verified)\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eFor in-ear gear, hygiene isn’t optional. Units are prepared with a \u003cstrong\u003esanitization protocol\u003c\/strong\u003e focused on \u003cstrong\u003eskin-contact surfaces\u003c\/strong\u003e and the nozzle interface, using material-safe methods.\u003c\/p\u003e\n\u003cp class=\"hfl-muted\"\u003e\u003cstrong\u003eUltrasonic cleaning is accessories-only\u003c\/strong\u003e (removable tips\/accessories where applicable)—never drivers or sensitive internals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdiv aria-hidden=\"true\" class=\"hfl-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp class=\"hfl-cta-bottom\"\u003e\u003cstrong\u003eNeed a specific wired IEM revision—or want fit, airflow, and source matching confirmed?\u003c\/strong\u003e Use \u003ca href=\"#\" class=\"hfl-cta-link\" data-hfl-chat=\"find_gear\" title=\"Request sourcing via concierge\"\u003e\u003cstrong\u003eHELP ME FIND GEAR\u003c\/strong\u003e\u003c\/a\u003e and include your budget, chain (DAP\/DAC\/amp), output type, and what you want to avoid (shout, sibilance, mid-bass bloom).\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"acoustune-hs1900x-shinogi-iem-used","title":"Acoustune HS1900X “SHINOGI” Wired IEMs - Mint - Verified by HiFiLoop","description":"\u003cdiv\u003e\n  \u003ch2\u003eThe Audiophile's Hook\u003c\/h2\u003e\n  \u003cp\u003e\n    Acoustune HS1900X “SHINOGI” is Japanese metalcraft turned into sound—fast, articulate dynamics with a clean, high-contrast presentation that stays controlled when the mix gets dense.\n    Mint condition, full set: reference-grade detail and build at a smarter-than-new price, verified by HiFiLoop.\n  \u003c\/p\u003e\n\n  \u003ch2\u003eCondition Report (The Truth)\u003c\/h2\u003e\n  \u003cp\u003e\u003cstrong\u003eMint \/ Collector Quality:\u003c\/strong\u003e Pristine, like new with minimal handling marks.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eNo obvious cosmetic defects observed.\u003c\/li\u003e\n    \u003cli\u003eFull retail set included (box and accessories as shown in the listing photos).\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eMandatory:\u003c\/strong\u003e The device has passed all functional tests.\u003c\/p\u003e\n\n  \u003ch2\u003eSonic Signature \u0026amp; Pairing\u003c\/h2\u003e\n  \u003cp\u003e\n    HS1900X is built around a single high-quality dynamic driver, aiming for natural timbre with speed and punch—an excellent match for listeners who want realistic instrument texture without losing separation.\n    For best results, pair it with a low-noise DAP and use the balanced output to maximize headroom and control.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    To unleash the full potential of this device, we recommend pairing it with gear from our \u003ca href=\"\/th\/collections\/digital-audio-players\"\u003eDigital Audio Players Collection\u003c\/a\u003e.\n  \u003c\/p\u003e\n\n  \u003ch2\u003eTechnical Highlights (Mobile-Table)\u003c\/h2\u003e\n  \u003ctable style=\"width:100%; border-collapse: collapse;\"\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDriver\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e10mm 3rd-gen Myrinx composite dynamic driver\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eImpedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e24Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eSensitivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e110 dB\/mW\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e10 Hz – 25 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eBuild\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eCNC titanium outer shell + multi-layer dry carbon fiber internal structure\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eCable \/ Termination\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eARC93 (tin-plated OFC), 4.4mm TRRRS balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eIEM Connector\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003ePentaconn Ear\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAcoustune HS1900X “SHINOGI” IEMs\u003c\/li\u003e\n    \u003cli\u003eARC93 stock cable (4.4mm balanced)\u003c\/li\u003e\n    \u003cli\u003eEar tips (AEX50 S\/M\/L + AEX70 S\/M\/L)\u003c\/li\u003e\n    \u003cli\u003eAluminum protective case + portable carrying case\u003c\/li\u003e\n    \u003cli\u003eEarphone clip and strap\u003c\/li\u003e\n    \u003cli\u003eRetail box and accessories (full set, as shown in photos)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eWhy Buy Used from HiFiLoop?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e✅ 14-Day DOA: Full refund\/replace if dead on arrival.\u003c\/li\u003e\n    \u003cli\u003e🔧 180-Day Warranty: Free repair service (buyer pays return shipping).\u003c\/li\u003e\n    \u003cli\u003e🔬 Lab Tested: I\/O integrity, noise floor, and channel balance verified.\u003c\/li\u003e\n    \u003cli\u003e📦 Free Shipping: Orders over $199.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eSee full Grading Scale in Footer Condition Guide.\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eCTA:\u003c\/strong\u003e Missed this? Contact “Help Me Find Gear”.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"HiFiLoop","offers":[{"title":"Default Title","offer_id":47684679499990,"sku":null,"price":779.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7445\/9862\/files\/acoustune-hs1900x-shinogi-iem-feature_1.jpg?v=1767065628"}],"url":"https:\/\/hifiloop.com\/th\/collections\/wired-iems.oembed","provider":"HiFiLoop","version":"1.0","type":"link"}