{"type":"firestarter.listing","listing":{"id":"lst_nTD2Zc1A","product_name":"SMSL DL300 AK4499EX + AK4191 Audio Decoder Headphone Amplifier","category":"Headphone DAC/Amp","description":"The SMSL DL300 Audio Decoder Headphone Amplifier is a premium desktop DAC and headphone amplifier designed for HiFi music playback, headphone listening, and high-resolution audio systems. Built with the flagship AK4499EX + AK4191 DAC chipset and XU-316 USB processor, the DL300 delivers clean, detailed, and dynamic sound performance with excellent decoding capability.\nThe DL300 supports DSD, MQA full decoding, and MQA-CD, making it suitable for high-resolution music playback and advanced desktop audio setups. It also supports high-quality Bluetooth codecs, including LDAC and aptX HD, allowing users to enjoy convenient wireless streaming with improved audio quality.\nWith 6.35mm single-ended and 4.4mm balanced headphone outputs, the DL300 can work with a wide range of headphones and IEMs. It also features 4 selectable sound tones, giving users more flexibility to adjust the sound based on their listening preferences. The DOP display helps accurately show the playback bitrate, while the ultra-low THD+N of -124dB supports clean and refined audio reproduction. This item is in open box condition.\nKey Features:\n\n\nSMSL DL300 audio decoder and headphone amplifier\n\n\nAK4499EX + AK4191 DAC chipset\n\n\nXU-316 USB processor\n\n\nSupports DSD playback\n\n\nMQA full decoder and MQA-CD support\n\n\nLDAC and aptX HD Bluetooth support\n\n\n6.35mm and 4.4mm headphone outputs\n\n\n4 selectable sound tones\n\n\nDOP display for accurate bitrate display\n\n\nUltra-low THD+N: -124dB\n\n\nGreat for desktop HiFi and headphone listening\n\n","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-headphone-dac-amp-smsl-dl300-ak4499ex-ak4191-audio-decoder-headphone-amplifier-1243942088.jpg?v=1781179874","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/id2a8418_large_b1566772-b853-47cb-b40c-e51f4097f349.jpg?v=1781179691","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-headphone-dac-amp-smsl-dl300-ak4499ex-ak4191-audio-decoder-headphone-amplifier-1243942089.jpg?v=1781178132"],"price":381.65,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.081Z"},"share_url":"https://firestarter.network/l/lst_nTD2Zc1A","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_nTD2Zc1A' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy SMSL DL300 AK4499EX + AK4191 Audio Decoder Headphone Amplifier' and a budget_max comfortably above $381.65 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."]}}