{"type":"firestarter.listing","listing":{"id":"lst_xFaXAnCb","product_name":"Auribus Acoustics Sierra Aluminum Open Back Headphones","category":"Headphone","description":"Note: This product is made-to-order and ships within one week.\nSierra Aluminum solid aluminum open-back headphones\nThe Sierra Aluminum is an evolution of the Sierra Reference, built to mark five years of the Auribus project. It pairs a warmer, more controlled tuning with single-piece aluminum construction and a lightweight 400g frame. A 50mm dynamic driver, angled 3D baffle, and open acoustic design work together to deliver wide staging, natural timbre, and full-range extension.\nSolid aluminum construction with SLM finish\nThe outer shell is formed using selective laser melting, a 3D metal printing process that produces a dense, durable aluminum structure. Each housing is hand ground and tumble polished, leaving a subtle raw texture unique to every unit. Beneath it sits a one-piece 3D printed enclosure that keeps resonance controlled while maintaining low weight for long listening sessions.\n3D baffle for spatial accuracy\nThe internal geometry places the driver at an angle relative to the ear, helping sound arrive more naturally. An asymmetrical aperture shapes how air and sound move through the chamber, widening the perceived stage without losing positional accuracy. This design supports layered recordings, making placement and depth easier to follow.\n50mm dynamic driver with paper cone\nThe Peerless paper cone driver emphasizes natural tone across the spectrum. Paper diaphragms are known for balanced stiffness and damping, which helps avoid harshness while preserving detail. Combined with the open acoustic structure, the result is a presentation that stays coherent from low bass through upper treble.\nLinear extension system for full-range response\nAn updated version of the Linear Extension System manages airflow and damping to maintain consistent output across frequencies. The design supports extension from 20Hz to 20kHz, allowing both low-end weight and high-frequency detail to come through without abrupt roll-off. This is especially noticeable in recordings with wi","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431874.jpg?v=1775683089","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431873.jpg?v=1775683028","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431872.jpg?v=1775682968","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431871.png?v=1775682909","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431877.jpg?v=1775682848","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431876.jpg?v=1775682788","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431875.jpg?v=1775682727","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-aluminum-open-back-headphones-1231431878.png?v=1775682668"],"price":1600,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.866Z"},"share_url":"https://firestarter.network/l/lst_xFaXAnCb","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_xFaXAnCb' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Auribus Acoustics Sierra Aluminum Open Back Headphones' and a budget_max comfortably above $1600.00 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."]}}