{"type":"firestarter.listing","listing":{"id":"lst_hnxQXQTL","product_name":"HarmonicDyne Black Hole","category":"Headphones","description":"\nAbout HarmonicDyne: The Pursuit of Better Sound\nHarmonicDyne’s goal is to deliver better sounding audio to the everyday music lover. HarmonicDyne has made its global success through several crowdfunding campaigns, including the Helios, Zeus, and Poseidon headphones. Each of these launches achieved the combination of amazing acoustic performance, bespoke craftsmanship, and budget-friendly affordability. HarmonicDyne will continue the tradition of designing and carefully manufacturing the best headphones that are accessible to every audience. \n\n\n\n\nA New Approach to Audiophile Headphones\nThe HarmonicDyne Black Hole features an all new approach to designing audiophile headphones. The two major focuses for this project were: 1) Hi-Fi sound quality & 2) Ergonomic Fit. The Black Hole delivers a truly audiophile sound signature that is immersive and engaging, all while being ultra-comfortable and lightweight. \n\n\n\n\n\n50mm Dynamic Driver with Professional Tuning\nThe Black Hole features a second generation of our large 50mm composite carbon fiber bio-film diaphragm, which is arranged in an inert sandwich structure. Having grown from our previous project, we have redesigned our target tonal signature to provide a more relevant and accurate sound that is suitable for audiophiles. We have redesigned the treble signature to better match the tonal perception of the human ear. This creates a more crisp and articulated sound signature that is detailed, yet pleasant to listen to. With a precise pinna at 3kHz that gradually decays into the upper treble frequencies, the Black Hole will present a natural and professional treble signature. Furthemore, the bass response has also been reimagined. The bass is incredibly powerful and resounding, with a massive 15dB subbass shelf. However, the mids from 600-1000Hz has been kept neutral to present a life-like and natural timbre to instruments and vocals. \n\n\n\n\n\nNew Ergonomic Design\nThe Black Hole features the second-generation of M-Type Pres","images":["https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0020.jpg?v=1703746095","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0026.jpg?v=1703746096","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0029.jpg?v=1703746095","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0034.jpg?v=1703746094","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0037.jpg?v=1703746095","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0039.jpg?v=1703746094","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0043.jpg?v=1703746096","https://cdn.shopify.com/s/files/1/0040/7201/3924/files/DSC0088.jpg?v=1703746094"],"price":99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:46.407Z"},"share_url":"https://firestarter.network/l/lst_hnxQXQTL","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_hnxQXQTL' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy HarmonicDyne Black Hole' and a budget_max comfortably above $99.00 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."]}}