{"type":"firestarter.listing","listing":{"id":"lst_-iMKnptg","product_name":"Apos TOPPING-900 Ensemble","category":"Apos Ensemble","description":"Ensemble, assemble!\nApos Ensembles are like the Avengers of audio gear: bundles assembled by our team to save your ears from the forces of mediocre sound. Every piece of equipment plays its part to deliver an unbeatable listening experience: a DAC to decode the 1s and 0s, an amp to power up the audio, and all the interconnections necessary to bring the team together.\nMeet the TOPPING-900 Series Ensemble\nThe Apos TOPPING-900 Ensemble is a bundle designed to provide you with a premium audio setup straight out of the box. \nFor the DAC, you'll get the TOPPING D900 a 1-bit PSRM architecture decoder, featuring proprietary I/V conversion and wireless support with LDAC. It includes a 10-band parametric EQ, an independent pre-amp mode, and a machined aluminum remote control. \nFor the amp, you'll get the TOPPING A900 Ultra-Flagship Headphone Amp, featuring the fully-balanced T'ang-ku-la amplifier circuit with 22,000mW per channel of output power. It supports both balanced and single-ended headphones with outputs including 4-pin XLR, 4.4 balanced, and 6.35mm SE. The amp also includes features like relay volume control, a preamp mode, and full-color display. Optionally, add the TOPPING Pre900 fully-balanced desktop preamplifier. 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, and a remote control. \nProducts in this bundle\nTOPPING D900 DAC (DIGITAL-TO-ANALOG CONVERTER)\n\n\nFully discrete 1-bit PSRM DAC architecture\n\n\nSelf-developed I/V circuitry\n\n\nSNR: 131dB; DNR: 131dB\n\n\nUltra-low jitter (-157dB)\n\n\nTHD+N: &lt;0.000055%\n\n\n10-band PEQ with desktop software\n\n\nAurora UI with full-color screen\n\n\nBluetooth 5.1 with LDAC and aptX HD\n\n\nPreamp mode with volume memory\n\n\n12V trigger in/out\n\n\nInputs:  USB-C, USB-B, optical, coaxial, Bluetooth, AES, or IIS-LVDS\n\n\nOutputs: XLR balanced preamp, XLR balanced line out\n\n\nTOPPING A900 Ultra-Flagship Headphone Am","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-apos-apos-ensemble-apos-topping-900-ensemble-1178032725.jpg?v=1752517238"],"price":2998,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:57.421Z"},"share_url":"https://firestarter.network/l/lst_-iMKnptg","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_-iMKnptg' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Apos TOPPING-900 Ensemble' and a budget_max comfortably above $2998.00 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."]}}