{"type":"firestarter.listing","listing":{"id":"lst_C-zJvRuf","product_name":"Fosi Audio IM4 10mm Dual-Cavity Dynamic Driver IEMs","category":null,"description":"Features:-\n>High-Performance Dynamic Driver IEMs.\n>Dual-Magnetic Dual-Cavity Dynamic Driver.\n>High-Purity Beryllium-Plated PU Suspension Diaphragm.\n>High-Strength Neodymium N52 Dual Magnets.\n>Dual-Chamber Construction.\n>CNC-Machined Aluminum Alloy Cavities.\n>Open-Back Shell Design.\n>High-Efficiency Acoustic Damping.\n>Two Sets of Swappable Nozzles.\n>Ergonomic Design for Comfortable Fit.\n>5N OFC Silver-Plated Cable.\nTechnical Information:-\n>Impedance: 21Ω.\n>Frequency Response Range: 20Hz~20kHz.\n>Sensitivity: 109dB.\n>Connector Type: 2-pin 0.78mm.\n>Termination Plug: 3.5mm Gold-Plated Plug.\n>Weight: 7g(per earbud).\nFosi Audio, known primarily for its portable as well as desktop HiFi audio gear is here with its very first pair of in-ear monitors, introducing the Fosi Audio IM4. It’s a single dynamic driver IEM designed with a specially-developed beryllium-plated PU suspension diaphragm. The pair features a dual-magnetic, dual-cavity dynamic driver unit with high-power Neodymium N52 magnets that provide high-efficiency and low distortion in the output. Fosi has crafted the pair with high-precision 5-axis CNC machining process using 6063 series aluminum alloy material. The shells have an open-back architecture to further enhance the sound performance with a wide soundstage. With high-efficiency acoustic damping, premium dual-cavity structure, and professional tuning, the Fosi Audio IM4 promises an enchanting sound response, one that captivates its listeners every single time!!\nHigh-Resolution Clarity with Premium Driver:-\nFosi Audio has equipped the IM4 with a high-performance dynamic driver unit. The pair houses a dual-cavity, dual-magnetic dynamic driver unit that adopts high-purity beryllium-plated dome and PU suspension diaphragm coil. It not only produces a rich sound but also provides enchanting performance with ultra-low THD+N characteristics. The driver is placed neatly in a dual-cavity structure specially optimized","images":["https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-252417.jpg?v=1762487954","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-im4-black-610022.jpg?v=1762487950","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-597146.jpg?v=1762487957","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-im4-silver-647876.jpg?v=1762487945","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-509378.jpg?v=1762487943","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-429800.jpg?v=1762487952","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/fosi-audio-im4-10mm-dual-cavity-dynamic-driver-iems-fosi-audio-829808.jpg?v=1762487947"],"price":93.34,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:28.657Z"},"share_url":"https://firestarter.network/l/lst_C-zJvRuf","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer ","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_C-zJvRuf' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Fosi Audio IM4 10mm Dual-Cavity Dynamic Driver IEMs' and a budget_max comfortably above $93.34 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}