{"type":"firestarter.listing","listing":{"id":"lst_ztkcF9ED","product_name":"KZ D-FI","category":"Clearance","description":"\n\n\nExtraordinary acoustic experience\nD-Fi adopts the exclusive custom dual-magnet & dual-cavity dynamic driver. Dual magnetic what it means dual magnetic circuit, whose magnetic field is enhanced by superimposing the magnetic force of 2 magnets, which to acieve energy efficiency and stronger transient performance.\n\n \n\n\n\nPioneering and innovative precise tuning method\nThe traditional tuning method is achieved by replacing dampers with different mesh numbers and sizes, but this method cannot accurately control a certain frequency band. KZ adopts innovative circuit board adjustment methods, which can accurately control each frequency band according to our target curve.\n\n \n\nStandard version and tunable version available\nD-Fi is designed with a standard version and a tunable version. Standard version has an accurate and balanced frequency response tuning. Tunable version can achieve 16 different sound styles by adjusting the toggle switch to meet the different needs of more players.\n\n \n\nPrecision 4-gear switches 16 tuning styles\nD-Fi adopts exclusive patented tuning technology and is equipped with precise 4 gear electronic switches. The first, second, and third gears are adjusted for low frequencies, and each additional gear increases the lower frequency. The fourth gear is adjusted for the full frequency band. Users can customize and adjust sixteen tuning styles according to their personal preferences to meet their individual needs for sound.\n\n \n\nThe dynamic king in the market\nThe king of dynamic IEM, classic U-shaped tuning,The bass is strong properly and clear, plus the natural and smooth sub bass, treble well-defined, suitable for a variety of music styles, easy to drive, which makes D-Fi becomes one of the dynamic king in the market.\n\n \n\nLow-frequency diving and excellent high-frequency performance\nFrequency response range is an important parameter for judging the sound quality of an earphone. Most earphones on the market have a frequency response width rang","images":["https://cdn.shopify.com/s/files/1/0040/7201/3924/products/4_80040bcd-5a8b-43cc-a0d3-41d65f99c1c8.png?v=1680245984","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/1_11c48db5-4e43-4e84-ba54-fbdd859be9a6.png?v=1680245983","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/3_03ad61f2-09b8-43e6-962c-55d629b3ea97.png?v=1680245983","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/2_5e765cba-6f65-46dd-97ab-46107edfc37b.png?v=1680245984","https://cdn.shopify.com/s/files/1/0040/7201/3924/products/D-Fi__05.jpg?v=1680247062"],"price":21.45,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:47.038Z"},"share_url":"https://firestarter.network/l/lst_ztkcF9ED","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_ztkcF9ED' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy KZ D-FI' and a budget_max comfortably above $21.45 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."]}}