{"type":"firestarter.listing","listing":{"id":"lst_ee6BnPY_","product_name":"FiiO K15 Desktop DAC/Amp","category":"Headphone DAC/Amp","description":" \nA fully-balanced streaming DAC/amp \nThe FiiO K15 is a fully-balanced DAC and headphone amplifier that combines streaming, local playback, and DAC/amp functionality in a single high-performance package. With dual AK4497S DAC chips, a discrete Class-AB headphone amp circuit, PEQ tuning, and a wide range of inputs and outputs—including balanced 4.4mm and XLR4 headphone jacks—the K15 will revive your audio setup. Whether you're playing from Roon, Bluetooth, a CD player, or a USB flash drive, the K15 decodes, amplifies, and delivers it all.\nDual AKM DACs with VELVET SOUND\nAt the core of the K15 are two AK4497S DAC chips, part of AKM’s newest generation of VELVET SOUND processors. These chips are beloved by audiophiles for their dynamic range, low distortion, and warm, lifelike tonality. \n\nDiscrete Class-AB headphone amplification\n\nThe K15’s headphone amplifier circuit uses a discrete OP + transistor current-boosting design based on the ON Semiconductor MJE243G/253G. This Class-AB circuit with carefully matched components and a balanced topology delivers up to 3000mW per channel, driving demanding planar magnetics and high-impedance dynamics with ease, while keeping noise low enough for IEMs.\n\nEight playback modes\n\nFrom USB DAC to Bluetooth receiver, from Roon streamer to local file player, adaptability is the K15’s middle name. Plug in your phone via USB-C, connect wirelessly via LDAC or AirPlay, or load up a flash drive with FLACs. Balanced and unbalanced line inputs let you use it as a headphone amp only, while digital coaxial and optical inputs make it easy to integrate legacy gear like CD players. \n\nFully-balanced signal path from start to finish\n\nThe K15 uses a fully differential circuit from digital-to-analog conversion through to the final headphone output stage. This architecture improves dynamic range, reduces noise, and cuts down on crosstalk, resulting in clean, spacious playback even at high volumes or with complex mixes.\n\nPhysically-isolated circuit sectio","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265830.jpg?v=1754418418","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265822.jpg?v=1761265740","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265829.jpg?v=1761265740","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265828.jpg?v=1754418413","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265827.jpg?v=1761265740","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265826.jpg?v=1754418407","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265825.jpg?v=1761265740","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265824.jpg?v=1754418399","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265823.jpg?v=1754418179","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265821.jpg?v=1761265740","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265820.jpg?v=1754418168","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265819.jpg?v=1754418165","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265818.jpg?v=1754418163","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k15-desktop-dac-amp-1183265817.jpg?v=1761265740"],"price":549.99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:57.380Z"},"share_url":"https://firestarter.network/l/lst_ee6BnPY_","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 <your Firestarter API key>","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_ee6BnPY_' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy FiiO K15 Desktop DAC/Amp' and a budget_max comfortably above $549.99 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."]}}