{"type":"firestarter.listing","listing":{"id":"lst_aH70Y7Wi","product_name":"TOPPING L50 Headphone Amp","category":"Headphone Amp","description":"Small in size, huge in power\nWith a small footprint and a 30dB gain range, the TOPPING L50 is a desktop amp that fits practically anywhere and powers just about anything. \nTwice the power of the L30\nThe L50 uses a newly redesigned NFCA circuit based on the one used in the A30 Pro. It provides twice the power of the L30 at higher impedances, while maintaining the same ultra-low noise and high dynamic range. \nTop-of-the-line NFCA performance\nEnjoy top-of-the-line dynamic range, SINAD, and THD+N thanks to the L50’s NFCA circuit. By using negative feedback loops, it reduces fluctuation in the output, resulting in THD of 0.00006%, SINAD of 125, and a dynamic range of 145dB. \nCalling all cans\nWith three gain settings that span almost 30dB, the L50 can power your whole collection of headphones. Its low noise level of 0.3uV means that you won’t hear background noise even on the most sensitive of IEMs, while its max output level of 37Vpp means it can meet the needs of extremely low-sensitivity full-sized headphones. \nAuto bypass\nWhen shut off, the L50 automatically outputs the signal to RCA or TRS without amplification, so you can keep the L50 in your audio chain even while using active speakers and/or a DAC’s preamp function. \nProduct highlights\n\nAuto bypass\n3 gain settings\nNFCA module\n<0.00006% THD+N\n145dB DNR\n<0.3uVrms noise\n<0.1Ω output impedance\nOutput power: 3500mW x2@16Ω, 540mW x2@300Ω\n\nSpecs\nSingle-ended input\n\nTHD+N@1kHz (A-wt)\n\n<0.00006% @ output=780mW (32Ω)\n<0.00006% @ output=333mW (300Ω)\n\nTHD 20-20kHz (90kBW)\n\n<0.00008% @output=780mW (32Ω)\n<0.00008% @output=76mW (300Ω)\n\nSNR Max out 1kHz (A-wt): 145dB\nSNR 50mV OUT 1kHz: 104dB\nDynamic range 1kHz (A-wt): 145dB\nFrequency response: 20Hz-40kHz (±0.05dB)\nOutput level\n\n35Vpp @G=L\n35Vpp @G=M\n37Vpp @G=H\n\nAP measured noise level (A-wt)\n\n<0.7uVrms @G=L \n<0.7uVrms @G=M\n<1.2uVrms @G=H\n\nActual noise level (A-wt)\n\n<0.3uVrms @G=L \n<0.3uVrms @G=M\n<1.0uVrms @G=H \n\nChannel crosstalk@1kHz: -119d","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847321837739.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322230955.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322132651.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322099883.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322198187.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322493099.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29850231668907.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29850232848555.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322722475.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29850202046635.jpg?v=1740198217","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29849947013291.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322329259.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322427563.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322656939.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322165419.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322624171.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322394795.jpg?v=1630376726","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-l50-headphone-amp-29847322460331.jpg?v=1630376726"],"price":169,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:00.704Z"},"share_url":"https://firestarter.network/l/lst_aH70Y7Wi","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 ","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_aH70Y7Wi' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy TOPPING L50 Headphone Amp' and a budget_max comfortably above $169.00 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."]}}