{"type":"firestarter.listing","listing":{"id":"lst_fWW44PXu","product_name":"Auribus Acoustics Sierra Reference Open Back Headphones","category":"Headphone","description":"Note: This product is made-to-order and ships within one week.\nSierra Reference angled baffle headphones\nThe Sierra Reference is a ground-up reconceptualization of what an open-back dynamic headphone can deliver. It combines true-to-life accuracy with physical impact and long-wearing comfort. Built around a 50mm dynamic driver, angled 3D baffle, and patented Linear Extension System, it delivers a spacious, detailed presentation with deep, controlled low-end reach. The 2025 revision refines both the mechanics and acoustics, making it a reliable tool for both critical listening and daily use.\nLightweight construction built in-house\nThe full assembly is produced using a combination of advanced polymers and aluminum, resulting in a structure that balances durability with reduced weight. At 0.75 lb (340g), it remains comfortable over long sessions while maintaining structural integrity. Each unit is built to order and assembled in California, allowing for careful quality control and serviceability over time.\n3D baffle with acoustic lens\nThe internal geometry places the driver at an angle relative to the ear, helping sound arrive more naturally. A precision-cut acoustic lens further shapes how sound disperses, improving spatial accuracy and depth. This design supports layered recordings, making placement and separation 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 patented Linear Extension System (Pat. 12,395,780 B2) manages airflow and damping to maintain consistent output across frequencies. The design supports extension from 20Hz to 20kHz, allowing both low-end weight and hi","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431862.jpg?v=1775682610","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431866.jpg?v=1775682548","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431869.jpg?v=1775682489","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431864.jpg?v=1775682428","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431865.jpg?v=1775682368","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431867.jpg?v=1775682309","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431863.jpg?v=1775682248","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431868.jpg?v=1775682188","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431870.png?v=1775682128"],"price":1200,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.862Z"},"share_url":"https://firestarter.network/l/lst_fWW44PXu","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_fWW44PXu' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Auribus Acoustics Sierra Reference Open Back Headphones' and a budget_max comfortably above $1200.00 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."]}}