{"type":"firestarter.listing","listing":{"id":"lst_mkcZbWs2","product_name":"LADDER Schumann Desktop DAC","category":"Headphone Amp","description":"High-resolution Audio DAC\nThe Schumann is a desktop DAC built around FPGA-based decoding, designed for systems that prioritize signal integrity, low noise, and straightforward control. It supports USB, coaxial, optical, I2S, and AES digital inputs, with both XLR and RCA analog outputs, covering common home and studio use without unnecessary extras.\nFPGA-based digital decoding\nThe Schumann uses an FPGA to handle its digital decoding and processing rather than relying on a fixed-function DAC pipeline. This approach allows tighter control over timing and data handling and supports jitter suppression at the hardware level. The result is stable decoding across sources and formats, without leaning on software correction after the fact.\nHigh SNR for low-key detail\nThe design emphasizes a high signal-to-noise ratio, which matters when the rest of your chain is quiet enough to reveal it. With sensitive amplifiers or speakers, background noise stays controlled and low-level information remains intact. This is especially relevant for near-field and low-volume listening.\nDigital inputs that cover common sources\nThe input selection is practical and complete—USB for computers and streamers, coaxial and optical for transports and TVs, I2S for compatible sources, and AES for professional or studio gear. Multiple sources can stay connected at once, reducing cable swapping and simplifying daily use.\nBalanced and unbalanced analog outputs\nThe Schumann provides both XLR and RCA outputs, making it easy to integrate into balanced or single-ended systems. XLR is useful for longer cable runs or noise-sensitive setups, while RCA keeps compatibility with traditional integrated amps and preamps.\nDirect front-panel control\nPhysical buttons on the front panel handle power, input selection, and operating modes. OS/NOS switching is available without menus or apps, allowing you to change oversampling behavior quickly. The control layout is functional and deliberately minimal.\nDual crystal oscillat","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406470.png?v=1767652147","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406468.png?v=1767652088","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406476.png?v=1767652028","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406475.png?v=1767651968","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406474.png?v=1767651911","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406473.png?v=1767651847","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406472.png?v=1767651788","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406471.png?v=1767651728","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406469.png?v=1767651668","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406478.png?v=1767651608","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-schumann-desktop-dac-1214406477.png?v=1767651550"],"price":1399,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:56.669Z"},"share_url":"https://firestarter.network/l/lst_mkcZbWs2","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_mkcZbWs2' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy LADDER Schumann Desktop DAC' and a budget_max comfortably above $1399.00 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."]}}