{"type":"firestarter.listing","listing":{"id":"lst_a_fj5FUN","product_name":"LADDER Handel Desktop USB Interface","category":"Headphone Amp","description":"digital USB interface with external clock inputs\nThe Ladder Handel is a dedicated digital USB interface designed to give you control over how digital audio moves from your source to your DAC. It accepts USB input and outputs AES, coaxial, optical, and I2S, with support for external clocking in systems built around synchronization and timing accuracy.\nBuilt to manage digital signal flow\nThe Handel sits between your source and your DAC when you want more options than a single USB connection allows. It lets you choose the output format that best matches your DAC, cabling, and system layout. The goal is clean digital handoff, fewer limitations, and predictable behavior in daily use.\nUSB input with multiple digital outputs\nUSB input feeds a full set of digital outputs, including AES, coaxial, optical, and I2S. AES is useful for longer runs and DACs that prioritize balanced digital connections. Coaxial and optical offer compatibility with a wide range of gear. I2S is available for DACs designed to take advantage of it, with selectable modes to support different implementations.\nExternal clock support for synchronized systems\nThe Handel includes dedicated clock inputs at 45.1584 MHz and 49.152 MHz. If your system uses an external clock, these inputs allow Handel to lock to it. This matters in multi-device digital chains where timing consistency is part of the design.\nClear front-panel indicators\nThe front panel displays the active sampling rate using dedicated indicators. You can confirm the incoming signal format at a glance without navigating menus or software controls.\nPower supply designed for stability\nThe internal power architecture uses multiple transformer groups, parallel MOSFET regulation, and large reservoir capacitance. Seventeen customized 2200u capacitors are specified to maintain steady voltage under load. This approach focuses on consistency rather than chasing numbers.\nIndependent voltage regulation\nMultiple LT1763 regulators provide independent power rail","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393148.jpg?v=1767654309","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393150.jpg?v=1767654248","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393158.png?v=1767652508","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393157.png?v=1767652448","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393156.png?v=1767654188","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393155.png?v=1767652387","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393154.png?v=1767652327","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393153.png?v=1767652269","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393152.png?v=1767652208","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393151.jpg?v=1767654128","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393149.jpg?v=1767654068","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393160.jpg?v=1767654010","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-handel-desktop-usb-interface-1214393159.jpg?v=1767653949"],"price":1899,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:56.673Z"},"share_url":"https://firestarter.network/l/lst_a_fj5FUN","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_a_fj5FUN' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy LADDER Handel Desktop USB Interface' and a budget_max comfortably above $1899.00 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."]}}