{"product_id":"64-audio-u4s-universal-hybrid-in-ear-monitors-clearance-open-box","title":"64 Audio U4s Universal Hybrid In-Ear Monitors - Clearance \/ Open Box","description":"\u003ch3\u003e64 Audio U4s Universal Hybrid In-Ear Monitors\u003c\/h3\u003e \u003cp\u003eThe 64 Audio U4s is a breakthrough 4-driver hybrid UIEM that brings flagship technology to a more accessible price point without sacrificing sonic performance. Combining one dynamic driver with three balanced armatures—including a patented tia™ high driver—the U4s delivers impactful sub-bass, neutral mids, and an open, airy treble for an immersive, fatigue-free listening experience. Enhanced by LID™ for consistent sound across devices and apex™ venting modules for pressure relief and expanded soundstage, U4s offers both comfort and tuning flexibility. Housed in an anodized Slate Blue aluminum shell with a meteorite-inspired faceplate, U4s is as stunning as it is sonically refined.\u003c\/p\u003e \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDriver Configuration\u003c\/strong\u003e: 1 tia High Driver, 1 High-Mid Driver, 1 Mid Driver, 1 Dynamic Low Driver\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response\u003c\/strong\u003e: 10 Hz – 20 kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSensitivity\u003c\/strong\u003e: 107 dB\/mW @ 1 kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eImpedance\u003c\/strong\u003e: 11 Ω @ 1 kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCrossover\u003c\/strong\u003e: Integrated 4-Way Passive Crossover with Electrical Low-Pass Filter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApex Isolation\u003c\/strong\u003e: -10 dB (mX), -15 dB (m15), -20 dB (m20)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShell Material\u003c\/strong\u003e: Anodized Aluminum with Meteorite-Inspired Faceplate\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Slate Blue\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCable\u003c\/strong\u003e: Black Premium Cable – Silver-Plated OCC Copper (7x7x4 Multi-Twist, 26 AWG, 0.23Ω), 3.5mm Termination\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories\u003c\/strong\u003e: Premium Leather Case, TrueFidelity Foam Tips (S\/M\/L), SpinFit Silicone Tips (S\/M\/L), Standard Silicone Tips (S\/M\/L), Apex Modules (m20, m15, mX), Cable Clip, Cleaning Tool, Round Sticker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTechnology\u003c\/strong\u003e: tia™ Driver \u0026amp; Single-Bore, apex™ Venting System, LID™, Electrical Low-Pass Filter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFit\u003c\/strong\u003e: Universal\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesigned \u0026amp; Assembled\u003c\/strong\u003e: In the USA with globally sourced components\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eExpanded Key Features List\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eHybrid Quad-Driver Design\u003c\/strong\u003e: Combines dynamic and balanced armature drivers for full-spectrum performance and low distortion.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003etia™ High Driver with Single-Bore\u003c\/strong\u003e: Delivers open, extended treble with reduced resonance and enhanced detail.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eapex™ Venting System\u003c\/strong\u003e: Includes three swappable modules (m20, m15, mX) for pressure relief and customizable isolation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLID™ Circuitry\u003c\/strong\u003e: Ensures tuning consistency across various devices regardless of output impedance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eElectrical Low-Pass Filter\u003c\/strong\u003e: Reduces low-frequency distortion by filtering unwanted signals before reaching the driver.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced, Engaging Sound\u003c\/strong\u003e: Deep sub-bass, clear mids, and smooth highs ideal for all genres at any volume.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePremium Slate Blue Shell\u003c\/strong\u003e: Anodized aluminum housing with a unique meteorite-inspired faceplate design.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBlack Premium Cable\u003c\/strong\u003e: Durable silver-plated copper cable with low resistance for optimal signal transmission.\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eQ\u0026amp;A Section\u003c\/h4\u003e \u003cp\u003e\u003cstrong\u003eQ: What type of sound can I expect from the U4s?\u003c\/strong\u003e\u003cbr\u003eA: U4s offers rich sub-bass, smooth mids, and airy treble with a spacious soundstage—perfectly suited for both casual listening and critical enjoyment.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: How many drivers are in the U4s?\u003c\/strong\u003e\u003cbr\u003eA: U4s features four drivers: one dynamic low, one mid, one high-mid, and one tia™ high driver for a full, coherent sound.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: What is the benefit of the tia™ technology in the U4s?\u003c\/strong\u003e\u003cbr\u003eA: The tia™ high driver and single-bore design eliminate traditional tubing to reduce resonance and distortion, improving treble clarity and realism.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: Can I customize the sound of the U4s?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it comes with three apex™ modules (mX, m15, m20) that alter isolation and subtly shift the tuning to match your preferences.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: What makes the faceplate design unique?\u003c\/strong\u003e\u003cbr\u003eA: The faceplate is inspired by Muonionalusta meteorite fragments and features a reflective finish that changes with light, making each unit visually distinctive.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: Does the U4s sound the same with different devices?\u003c\/strong\u003e\u003cbr\u003eA: Thanks to LID™ technology, U4s maintains its intended sound signature across a wide range of sources, including DACs, amps, and smartphones.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: Is the cable included and upgradeable?\u003c\/strong\u003e\u003cbr\u003eA: Yes, U4s includes a 3.5mm black premium cable and uses a standard 0.78mm 2-pin connection for easy upgrades.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: What accessories are provided with the U4s?\u003c\/strong\u003e\u003cbr\u003eA: You receive a premium leather case, full tip kit (foam, silicone, SpinFit), apex modules, cable clip, cleaning tool, and sticker.\u003c\/p\u003e","brand":"64 Audio","offers":[{"title":"Default Title","offer_id":62904101863583,"sku":"64A-OBX-U4S-BLU","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/38051d18-38d2-417f-8556-12151af450f6.jpg?v=1793984303","url":"https:\/\/listenup.com\/products\/64-audio-u4s-universal-hybrid-in-ear-monitors-clearance-open-box","provider":"ListenUp","version":"1.0","type":"link"}