{"product_id":"fosi-audio-im4","title":"Fosi Audio IM4 | Dynamic Universal Open-Back IEMs","description":"\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto; width: 65%;\" alt=\"fosi-audio-logo\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fosi-audio-logo.webp?v=1753282757\"\u003e\u003c\/p\u003e\n\u003ch4\u003eFosi Audio Enters the World of IEMs with the IM4, Delivering Rich Musical Detail with an Open-Back Design\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e10mm PU Beryllium-coated diaphragm\u003c\/li\u003e\n\u003cli\u003eDual-chamber acoustic design\u003c\/li\u003e\n\u003cli\u003ePowerful N52 dual-magnet for control and speed\u003c\/li\u003e\n\u003cli\u003eIncludes OFC Silver-plated cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fosi-im4-banner.webp?v=1761252732\" width=\"2048\" height=\"1200\" alt=\"Fosi Audio IM4 iems front center on black orange background\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFosi's First IEM\u003c\/h3\u003e\n\u003cp\u003eThe name \"IM4\" reflects the phrase \"I am for,\" a declaration of support, advocacy, and identity. It is open-ended, inviting participation inside and out in both aesthetics and sound. \u003c\/p\u003e\n\u003cp\u003eThe IM4 features an open-back acoustic design and a 10mm beryllium-coated diaphragm driver, delivering a spacious soundstage and musical detail, a true reflection of Fosi's brand spirit: Hear the Unheard. Their tuning team aimed to create a balanced, relaxed, and versatile listening experience.\u003c\/p\u003e\n\u003ch3\u003eHigh-Fidelity Sound\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e10mm PU Beryllium-Coated Diaphragm\u003c\/strong\u003e\u003cbr\u003ePU ensures smooth mids and punchy lows, while the beryllium coating adds clarity and sparkle to high frequencies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eN52 Dual-Magnet\u003c\/strong\u003e\u003cbr\u003eA powerful, stable magnetic field improves control and speed, delivering cleaner sound with better dynamics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Chamber Acoustic Design\u003c\/strong\u003e\u003cbr\u003eThe front chamber's nine-port design ensures balanced frequencies, while the rear chamber extends treble detail. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOFC Silver-Plated Cable\u003c\/strong\u003e\u003cbr\u003eBraided with 4 strands of 392-core 5N high-purity OFC silver-plated wire, the cable offers excellent signal transmission and shielding for richly detailed sound. \u003c\/p\u003e\n\u003ch3\u003eEffortless Acoustics with Natural Flow\u003c\/h3\u003e\n\u003cp\u003eThe open-back design of IM4 minimizes internal reflections and pressure buildup, creating a more open, natural sound with reduced fatigue. The rear chamber is filled with acoustic damping material to absorb standing waves, reducing distortion and harshness. The IM4 was tuned with listener feedback to ensure smooth, balanced sound across genres. \u003c\/p\u003e\n\u003ch3\u003eComfortable Fit\u003c\/h3\u003e\n\u003cp\u003eDeveloped with insights from millions of hearing-aid fitting samples, the ergonomic housing adapts to diverse ear shapes, delivering a secure and seamless fit. Crafted from CNC-machined aluminum alloy, IM4 offers a smooth touch that's gentle on the skin. The hollowed structure cuts the weight to just 38g, providing pressure-free comfort for long listening. \u003c\/p\u003e\n\u003ch3\u003eSwappable Components\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSound Nozzles\u003c\/strong\u003e\u003cbr\u003eComes with both aluminum alloy and brass nozzles. Aluminum reduces sibilance with added brass; brass enhances mids and treble with clarity. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTuning Ear Tips\u003c\/strong\u003e\u003cbr\u003eIncludes three tuning sets: balanced, bass, and deep bass. Each available in S\/M\/L sizes. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2-Pin 0.78mm Cable\u003c\/strong\u003e\u003cbr\u003eThe detachable 2-pin design supports 3.5mm and 4.4mm cable upgrades, allowing flexible customization. \u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Silver","offer_id":41844993654859,"sku":"FSI-IM4-SLV","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":41844993687627,"sku":"FSI-IM4-BLK","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Black - Open Box","offer_id":42203940454475,"sku":"FSI-IM4-BLK-OB","price":89.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/fosi-im4-thumb.webp?v=1761252535","url":"https:\/\/bloomaudio.mom\/products\/fosi-audio-im4","provider":"Bloom Audio","version":"1.0","type":"link"}