{"product_id":"fosi-audio-im4-open-back-dynamic-driver-in-ear-monitors","title":"Fosi Audio IM4 Open-Back Dynamic Driver In-Ear Monitors","description":"\u003cp\u003eExperience open, fatigue-free audio listening with the Fosi Audio IM4. Featuring a 10mm beryllium-coated dynamic driver housed in a 5-axis CNC-machined aluminum shell with an open-back architecture, the IM4 delivers punchy low-end impact, warm organic vocals, and an expansive soundstage.\u003c\/p\u003e\n\u003cp\u003eKey Features\u003c\/p\u003e\n\u003cp\u003e* Beryllium-Coated PU Diaphragm Dynamic Driver\u003cbr\u003eDriven by a 10mm dual-magnetic, dual-cavity dynamic driver with high-strength N52 neodymium magnets, the beryllium-plated PU diaphragm provides rigid driver control, swift transient response, and low harmonic distortion.\u003c\/p\u003e\n\u003cp\u003e* Open-Back Acoustic Shell Architecture\u003cbr\u003eIncorporates open-back rear chamber venting that relieves ear canal pressure, expands soundstage dimensions beyond typical closed-back designs, and reduces long-term listening fatigue.\u003c\/p\u003e\n\u003cp\u003e* Precision CNC 6063 Aluminum Alloy Cavities\u003cbr\u003eCarved from solid 6063-series aluminum alloy using 5-axis CNC milling, the durable, lightweight earpieces offer an ergonomic pseudo-custom fit tailored for long listening sessions.\u003c\/p\u003e\n\u003cp\u003e* Swappable Sound Tuning Nozzles\u003cbr\u003eCustomize your treble profile using interchangeable nozzle filters. The stock aluminum nozzles offer a smooth, balanced presentation, while the brass nozzles add extra clarity and upper-midrange presence.\u003c\/p\u003e\n\u003cp\u003e* High-Purity Detachable Silver-Plated Cable\u003cbr\u003eIncludes a 4-core, 392-strand 5N oxygen-free copper silver-plated cable featuring standard 0.78mm 2-pin connectors and a gold-plated 3.5mm plug for stable signal transmission.\u003c\/p\u003e\n\u003cp\u003e* Easy to Drive Across Mobile and Desktop Sources\u003cbr\u003eWith a high sensitivity rating of 109 dB and a 21 Ohm impedance, the IM4 plays cleanly directly from portable DAC dongles, smartphones, or dedicated headphone amplifiers.\u003c\/p\u003e\n\u003cp\u003eWhat is in the Box\u003c\/p\u003e\n\u003cp\u003e* 1 Pair x Fosi Audio IM4 IEM Earbuds\u003cbr\u003e* 1 x 4-Core 5N OFC Silver-Plated Cable (0.78mm 2-Pin to 3.5mm)\u003cbr\u003e* 2 Pairs x Interchangeable Tuning Nozzles (Aluminum and Brass)\u003cbr\u003e* 3 Pairs x Balanced Eartips (Small, Medium, Large)\u003cbr\u003e* 3 Pairs x Bass Eartips (Small, Medium, Large)\u003cbr\u003e* 1 x Faux Leather Carrying Case\u003cbr\u003e* 1 x User Manual\u003c\/p\u003e\n\u003cp\u003eTechnical Specifications\u003c\/p\u003e\n\u003cp\u003e* Driver Unit: 10mm N52 Dual-Magnet Dual-Cavity Dynamic Driver\u003cbr\u003e* Diaphragm Material: Polyurethane (PU) with Beryllium Coating\u003cbr\u003e* Housing Material: 5-Axis CNC-Machined 6063 Aluminum Alloy\u003cbr\u003e* Acoustic Structure: Dual Chamber Open-Back Design\u003cbr\u003e* Frequency Response: 20Hz - 20kHz\u003cbr\u003e* Impedance: 21 Ohms\u003cbr\u003e* Sensitivity: 109 dB\/V (92 dB\/mW)\u003cbr\u003e* Cable Connector: 0.78mm 2-Pin Detachable\u003cbr\u003e* Plug Termination: 3.5mm Gold-Plated Single-Ended\u003cbr\u003e* Earpiece Weight: 7 grams per earbud\u003cbr\u003e\u003c\/p\u003e","brand":"Stars Picker Audio Library","offers":[{"title":"Black","offer_id":50676229800133,"sku":"900944","price":410.0,"currency_code":"MYR","in_stock":false},{"title":"Silver","offer_id":50676229832901,"sku":"9001111","price":410.0,"currency_code":"MYR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0577\/8748\/2309\/files\/ShopifyProductpages_67.png?v=1792306472","url":"https:\/\/starspickeraudio.net\/products\/fosi-audio-im4-open-back-dynamic-driver-in-ear-monitors","provider":"Stars Picker Audio Library","version":"1.0","type":"link"}