{"type":"firestarter.listing","listing":{"id":"lst_Yo-ClNBo","product_name":"LADDER Czerny R2R Desktop DAC","category":"Headphone Amp","description":"Femtosecond clocked r2r dac\nThe Czerny is LADDER’s flagship digital decoder. Built around a proprietary R2R + DSD architecture with true balanced 24-bit R2R and 6-bit DSD conversion, a 32-step FIR filter, and FPGA-based processing, it's made for clean switching between sources, balanced XLR output to your amp, and support for modern high-rate files over USB, including DSD1024 and PCM1536.\nProprietary r2r + dsd decoding\nInstead of a typical delta-sigma DAC chip, the Czerny uses a discrete R2R path for PCM alongside a dedicated DSD approach. In plain English, it’s designed to convert digital to analog with tight control over accuracy and consistency, using hand-matched 0.01% resistors to keep channel balance and linearity as tight as possible. \nTrue balanced output you can actually use\nThe Czerny is made for balanced gear. You get balanced XLR output for longer cable runs and better noise rejection in real rooms, plus single-ended RCA when you need it. Output levels are rated at 4.0Vrms on XLR and 2.0Vrms on RCA.\nLow noise, measurable performance\nTotal harmonic distortion plus noise is listed at 0.004%, signal-to-noise ratio at 115dB, and dynamic range at 119dB. These numbers translate to a quiet background and clean headroom, especially noticeable late at night, low volume, and with resolving headphones or near-field monitors.\nClocking and buffering for cleaner timing\nTiming errors show up as haze and softness. The Czerny leans on dual femtosecond crystal oscillators (45.1548MHz and 49.152MHz) and a FIFO buffer to steady the data stream before conversion, giving you more stable edges and image placement.\nFPGA processing with oversampling or nos modes\nThe signal processing is handled via FPGA, with selectable oversampling (OS) and non-oversampling (NOS). OS applies digital filtering and can sound tighter and more controlled depending on your chain. NOS skips that stage for a more direct path. \nInputs for all\nUSB, coaxial, optical, and I²S are all here, so you can keep","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393161.png?v=1767652928","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393163.png?v=1767652868","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393164.png?v=1767652808","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393165.png?v=1767652749","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393168.png?v=1767654368","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393167.png?v=1767652689","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393166.png?v=1767652627","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ladder-headphone-amp-ladder-czerny-r2r-desktop-dac-1214393162.png?v=1767652568"],"price":829,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:56.677Z"},"share_url":"https://firestarter.network/l/lst_Yo-ClNBo","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_Yo-ClNBo' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy LADDER Czerny R2R Desktop DAC' and a budget_max comfortably above $829.00 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."]}}