{"type":"firestarter.listing","listing":{"id":"lst_PATPHAVw","product_name":"Fosi Audio MC331 Tube Integrated Amplifier with DAC","category":"Speaker Amp","description":"The Fosi Audio MC331 Tube Integrated Amplifier with DAC is a versatile 2-channel home audio amplifier designed for HiFi bookshelf speakers and headphone listening. Combining a vintage-style tube preamp design with modern digital connectivity, the MC331 delivers warm, detailed sound with strong output performance for desktop and home stereo setups.Built with an integrated DAC, the MC331 supports multiple input options including Bluetooth, USB, Optical, Coaxial, and RCA, making it easy to connect with computers, TVs, CD players, streamers, phones, and other audio sources. It also includes a 3.5mm headphone output, allowing users to enjoy private listening with wired headphones.The vintage VU meter display adds a classic HiFi look while showing real-time audio signal movement. With its compact design, tube-style sound character, and flexible connection options, the MC331 is a great choice for powering passive bookshelf speakers or creating a stylish desktop audio system. This item is in open box condition.Key Features:\nFosi Audio MC331 tube integrated amplifier with DAC\n2-channel stereo power amplifier for home audio\nDesigned for HiFi bookshelf speakers\n3.5mm headphone output for private listening\nVintage VU meter display\nTube preamp design for warm sound character\nBluetooth wireless input\nUSB, Optical, Coaxial, and RCA input options\nGreat for desktop, TV, and home stereo setups\n","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-speaker-amp-fosi-audio-mc331-tube-integrated-amplifier-with-dac-1241197277.jpg?v=1780391890","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-speaker-amp-fosi-audio-mc331-tube-integrated-amplifier-with-dac-1241197278.jpg?v=1780388710","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-speaker-amp-fosi-audio-mc331-tube-integrated-amplifier-with-dac-1241197276.jpg?v=1780388591","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-addsoap-speaker-amp-fosi-audio-mc331-tube-integrated-amplifier-with-dac-1241197275.jpg?v=1780388528"],"price":112.19,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.276Z"},"share_url":"https://firestarter.network/l/lst_PATPHAVw","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_PATPHAVw' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Fosi Audio MC331 Tube Integrated Amplifier with DAC' and a budget_max comfortably above $112.19 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."]}}