{"product_id":"fosi-audio-i5-open-back-planar-magnetic-headphones","title":"Fosi Audio i5 Open-Back Planar Magnetic Headphones","description":"\u003ch3\u003eFosi Audio i5 Open-Back Planar Magnetic Headphones\u003c\/h3\u003e \u003cp\u003eExperience exceptional detail, natural sound, and premium craftsmanship with the Fosi Audio i5 Open-Back Planar Magnetic Headphones. Designed for audiophiles and critical listeners, the i5 combines an ultra-large 97mm planar magnetic driver, an advanced 2μm nano-thin diaphragm, and a precision-engineered magnetic system to deliver outstanding clarity, fast transient response, and low distortion. Its open-back design creates a spacious, immersive soundstage that brings out the subtle textures, instrument separation, and dynamics of your favorite recordings.\u003c\/p\u003e \u003cp\u003eAt the heart of the Fosi Audio i5 is an advanced planar magnetic transducer featuring a magnetron-sputtered silver alloy conductive layer and 44 high-strength N50 neodymium magnets. This sophisticated driver architecture provides precise diaphragm control across an extended 10Hz–50kHz frequency response, reproducing everything from deep bass notes to delicate high-frequency details. The acoustically transparent rear grille minimizes unwanted resonance and acoustic resistance, allowing music to sound open, natural, and remarkably lifelike.\u003c\/p\u003e \u003cp\u003ePremium materials and thoughtful ergonomics make the i5 equally impressive in design and comfort. Handcrafted walnut wood chambers complement a CNC-machined aluminum frame, while a flexible memory-steel headband, genuine sheepskin headband covering, and multi-axis adjustable earcups provide a secure, adaptable fit. Breathable, cushioned ear pads and precision silicone adjustment sliders help distribute pressure comfortably during extended listening sessions. With a 28-ohm impedance and 98dB\/mW sensitivity, the i5 is compatible with a variety of headphone amplification setups, although Fosi Audio recommends at least 500mW of output power for optimal performance.\u003c\/p\u003e \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e i5\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Over-ear planar magnetic headphones\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAcoustic Design:\u003c\/strong\u003e Open-back\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDriver Type:\u003c\/strong\u003e Planar magnetic transducer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDriver Size:\u003c\/strong\u003e 97mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDiaphragm Thickness:\u003c\/strong\u003e 2μm ultra-thin diaphragm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDiaphragm Technology:\u003c\/strong\u003e Nano-thin diaphragm with magnetron-sputtered silver alloy conductive coating\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConductive Layer:\u003c\/strong\u003e Approximately 1.3μm silver metal voice coil coating\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMagnetic System:\u003c\/strong\u003e 44 N50-grade neodymium magnets total, with 22 magnets per driver\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10Hz–50kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNominal Impedance:\u003c\/strong\u003e 28 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e 98dB\/mW at 1kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Sound Pressure Level:\u003c\/strong\u003e ≥120dB SPL\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e Less than 1% at 100dB SPL\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRecommended Amplifier Power:\u003c\/strong\u003e ≥500mW\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Construction:\u003c\/strong\u003e Handcrafted walnut wood chambers and CNC-machined aluminum frame\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRear Grille:\u003c\/strong\u003e Acoustically transparent rigid open-back mesh\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadband:\u003c\/strong\u003e Flexible memory-steel construction with genuine sheepskin covering\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadband Adjustment:\u003c\/strong\u003e Precision silicone adjustment sliders\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEarcup Design:\u003c\/strong\u003e Multi-axis pivoting earcups\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEar Pads:\u003c\/strong\u003e Breathable cushioned pads with memory foam\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 550g\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e Wired\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Cable:\u003c\/strong\u003e 3.5mm headphone cable\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Adapter:\u003c\/strong\u003e 6.35mm headphone adapter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAdditional Included Accessories:\u003c\/strong\u003e User manual\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eUltra-Large 97mm Planar Magnetic Drivers:\u003c\/strong\u003e Advanced planar magnetic transducers with ultra-thin diaphragms deliver exceptional resolution, accurate instrument separation, and fast transient response for detailed, engaging music reproduction.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExpansive Open-Back Soundstage:\u003c\/strong\u003e An acoustically transparent rear grille reduces unwanted resonance and allows sound to develop naturally, creating an open and immersive presentation with excellent spatial imaging.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePrecision Magnetic System:\u003c\/strong\u003e A symmetrical arrangement of 44 N50 neodymium magnets provides precise diaphragm control, reducing nonlinear distortion and preserving delicate musical details.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAdvanced Silver Alloy Diaphragm Coating:\u003c\/strong\u003e Magnetron-sputtered conductive material helps improve signal responsiveness, sound clarity, and long-term driver consistency.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePremium Walnut and Aluminum Construction:\u003c\/strong\u003e Handcrafted walnut chambers, CNC-machined aluminum components, and refined finishing details combine durability with a sophisticated audiophile aesthetic.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesigned for Extended Listening:\u003c\/strong\u003e A flexible memory-steel headband, multi-axis pivoting earcups, adjustable silicone sliders, and breathable cushioned ear pads create an adaptable fit for longer listening sessions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExtended Frequency Reproduction:\u003c\/strong\u003e A wide 10Hz–50kHz frequency response supports deep low-frequency extension, articulate midrange reproduction, and detailed high-frequency performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExcellent for Dedicated Hi-Fi Systems:\u003c\/strong\u003e The i5 is well suited to desktop DAC and headphone amplifier setups, with Fosi Audio recommending at least 500mW of amplifier power for optimal results.\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eFAQ Section\u003c\/h4\u003e \u003cp\u003e\u003cstrong\u003eQ: What type of headphones are the Fosi Audio i5?\u003c\/strong\u003e\u003cbr\u003eA: The Fosi Audio i5 are wired, open-back, over-ear planar magnetic headphones designed for high-fidelity music listening. They feature large 97mm planar drivers that deliver detailed sound, fast transient response, and a spacious listening experience.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: What are the benefits of planar magnetic drivers?\u003c\/strong\u003e\u003cbr\u003eA: Planar magnetic drivers use a thin diaphragm controlled by a magnetic field to reproduce sound with precise movement and low distortion. The i5 uses a 2μm ultra-thin diaphragm and 44 N50 neodymium magnets to reproduce subtle musical details, accurate instrument separation, and controlled dynamics.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ: Do the Fosi Audio i5 headphones need an amplifier?\u003c\/strong\u003e\u003cbr\u003eA: A dedicated headphone amplifier is recommended for optimal performance. Although the i5 has a nominal impedance of 28 ohms and a sensitivity of 98dB\/mW, Fosi Audio recommends an amplifier capable of delivering at least 500mW of output power.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887243612319,"sku":"FOS-I5-BRO","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/b3ce8967-796e-49e0-8b91-3847deb115f9.jpg?v=1791557354","url":"https:\/\/listenup.com\/products\/fosi-audio-i5-open-back-planar-magnetic-headphones","provider":"ListenUp","version":"1.0","type":"link"}