{"type":"firestarter.listing","listing":{"id":"lst_ZJRyv3Lo","product_name":"FiiO K13 R2R Desktop DAC/Amp","category":"Headphone DAC/Amp","description":"\nA new way to hear your music\n\nThe K13 R2R is a fully-balanced desktop DAC and headphone amplifier that leans on FIIO’s proprietary 24-bit R2R resistor arrays, a powerful 2400mW+2400mW balanced output, and a wealth of tuning and connectivity options. With dual NOS/OS modes, LDAC Bluetooth, and a precision 10-band PEQ, it gives you control over both the flavor and fidelity of your music. \n\nFully differential 24-bit R2R DAC\n\nAt the heart of the K13 R2R are four channels of resistor arrays: 48 precision-thin film resistors per channel, 192 in total. Each resistor is matched to 0.1% accuracy with ultra-low temperature drift. The result is a true 24-bit fully differential R2R DAC that delivers a sound signature that’s rich, organic, and natural. Lower FFT harmonics mean darker backgrounds and less noise, so what you hear is only the music.\nDouble the fun with Dual NOS/OS modes\nNOS (Non-Oversampling) Mode: Maintains the original sampling rate for decoding, preserving the authentic sound and allowing you to enjoy an organic and captivating musical experience. OS (Oversampling) Mode: Upsamples globally to a high sampling rate of 384kHz, for superior audio performance and even more refined, clear sound.\nPreamplifier + power amplifier output\nWith a wide variety of inputs and outputs, this unit functions as both a preamplifier and a power amplifier, catering to various listening preferences. It also supports PCM 384kHz/32bit and DSD256 decoding, allowing it to effortlessly process high-resolution audio signals to deliver rich sonic detail and for an outstanding listening experience.\n\n10-band high-precision PEQ\n\nFine-tune the sound to your taste. The built-in parametric EQ, powered by the XMOS XU316 chip and FIIO’s proprietary tuning algorithm, supports 10-band adjustment across all modes. Use the FIIO Control app or web interface to load presets like “Retro PEQ,” match headphone response curves, or share your own EQ curves. \n\nBalanced from start to finish\n\nFrom DAC to LPF to v","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1186818425.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1186818426.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095449.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095444.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095442.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095456.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095455.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095454.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095453.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095451.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095450.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095448.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095447.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095446.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095445.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095443.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095441.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095440.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095439.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095452.jpg?v=1761321118","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-fiio-headphone-dac-amp-fiio-k13-r2r-desktop-dac-amp-1192095457.jpg?v=1761321118"],"price":319.99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:57.280Z"},"share_url":"https://firestarter.network/l/lst_ZJRyv3Lo","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_ZJRyv3Lo' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy FiiO K13 R2R Desktop DAC/Amp' and a budget_max comfortably above $319.99 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."]}}