{"type":"firestarter.listing","listing":{"id":"lst_WpcZqmT4","product_name":"FiiO Warmer Desktop R2R Tube Buffer and DAC","category":"DAC (Digital-to-Analog Converter)","description":"R2R desktop DAC with JJ tube buffer\nThe WARMER R2R leans into tone. It’s a desktop R2R DAC with a tube buffer that adds body, color, and a relaxed kind of fullness that digital sometimes forgets. The fully-differential 24-bit resistor-array DAC sets the baseline with steady, unforced detail. Four JJ Electronic E88CC tubes bring a soft glow to the mids. Dual mechanical VU meters add a warm pulse to the room. With multiple digital and analog inputs, it works just as easily on a desk as it does in a living room system. When you want music to feel easy and inviting, this is a good way to get there.\n\nExtensive connectivity\nUSB, optical, and coaxial inputs let you move between sources quickly. RCA and XLR outputs cover powered speakers, integrated amplifiers, and headphone amplifiers. Both outputs can run at the same time, which is handy if you enjoy switching between speakers and headphones during the day.\n\n\nFully-differential 24-bit R2R DAC\n\nFIIO’s four-way fully-differential R2R design uses 192 thin-film resistors with 0.1% accuracy and low drift. It delivers the grounded, weighted presentation R2R fans look for. Instruments sit where they should. Details feel natural rather than etched. It’s a DAC that trades flash for ease.\n\n\nTube warmth with JJ Electronic E88CC valves\n\nThe tube buffer uses four JJ Electronic E88CC tubes fed by a ±28V high-voltage supply. JJ tubes are steady performers with a long service life, and here they bring a rounded, organic character to the signal. Edges soften. Vocals pick up a little more texture. If you like your music with a touch of warmth, the tubes handle that work gracefully.\n\n\nLED-lit mechanical VU meters\n\nThe dual VU meters add a subtle sense of motion to your desk. They’re true mechanical meters powered by a dedicated IC, not a digital animation, so they move with a tactile kind of honesty. The warm backlight settles into the background and sets the tone for late evening listening.\n\nLow-noise linear power supply\nA 46W toroidal tra","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599703.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599704.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599705.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599713.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599712.png?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599711.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599710.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599709.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599708.jpg?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599707.png?v=1768488992","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-dac-digital-to-analog-converter-fiio-warmer-desktop-r2r-tube-buffer-and-dac-1207599706.png?v=1768488992"],"price":349.99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:56.946Z"},"share_url":"https://firestarter.network/l/lst_WpcZqmT4","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_WpcZqmT4' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy FiiO Warmer Desktop R2R Tube Buffer and DAC' and a budget_max comfortably above $349.99 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."]}}