{"type":"firestarter.listing","listing":{"id":"lst_D0e8yoRO","product_name":"TOPPING Pre900 Fully-Balanced Desktop Pre-Amplifier","category":"Preamplifier","description":"Flagship balanced pre-amplifier\nThe TOPPING Pre900 is a fully-balanced desktop preamplifier built for a dedicated two-channel system or flagship headphone stack. It combines a four-channel balanced architecture, 0.1 dB relay volume control, three balanced combo inputs, one pair of XLR balanced outputs, independent power supplies, a color display, remote control, and measured performance down to 0.00005% THD+N.\nFully-balanced signal path\nThe Pre900 uses a four-channel reference-grade amplification circuit with true end-to-end differential design from input to output. Left and right channels are physically isolated to help suppress noise and electromagnetic interference, giving your source signal a clean path through the preamp.\nRelay volume control\nA relay array and high-precision resistor network give the Pre900 1,000 steps of volume adjustment in 0.1 dB increments. That means you can make small, repeatable changes without throwing off channel balance. Crosstalk is kept below -150 dB, guaranteeing that the left and right channels stay synchronized as volume changes.\nHeadroom for demanding systems\nWith output swing up to 69 Vpp and gain up to 19.9 dB, the Pre900 gives your system room to handle transient peaks without clipping. Its actual noise level is rated below 0.3 μVrms at low gain, so delicate signals can be amplified without adding audible noise.\nThree balanced inputs\nThree sets of stereo balanced combo inputs support both XLR and 6.35mm TRS connections. The inputs use Neutrik combo sockets, making the Pre900 easy to integrate with DACs, studio gear, and other balanced sources.\nFocused balanced output\nThe Pre900 includes one pair of XLR balanced outputs for a clean, dedicated signal path. It also supports 12V trigger input and output, so compatible upstream and downstream devices can power on and off together.\nResponsive control\nA 2.0-inch high-definition color display gives you clear access to playback information, FFT view, VU meter mode, gain, channel balan","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062924.jpg?v=1778640069","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062925.jpg?v=1778640009","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062945.jpg?v=1778639950","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062944.jpg?v=1778639890","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062943.jpg?v=1778639835","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062942.jpg?v=1778639770","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062941.jpg?v=1778639709","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062940.jpg?v=1778639649","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062939.jpg?v=1778639589","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062938.jpg?v=1778639529","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062937.jpg?v=1778639470","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062936.jpg?v=1778639412","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062935.jpg?v=1778639349","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062934.jpg?v=1778639290","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062933.jpg?v=1778639230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062932.jpg?v=1778639169","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062931.jpg?v=1778639111","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062930.jpg?v=1778639050","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062929.jpg?v=1778638989","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062928.jpg?v=1778638930","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062927.jpg?v=1778638869","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062926.jpg?v=1778638808","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062947.jpg?v=1778638753","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062946.jpg?v=1778638690"],"price":1499,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.793Z"},"share_url":"https://firestarter.network/l/lst_D0e8yoRO","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_D0e8yoRO' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy TOPPING Pre900 Fully-Balanced Desktop Pre-Amplifier' and a budget_max comfortably above $1499.00 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."]}}