{"type":"firestarter.listing","listing":{"id":"lst_DyA4SgEL","product_name":"TOPPING PA3s Fully Balanced Class D Amplifier","category":"Headphone DAC/Amp","description":"\nFully balanced, super efficient \nThe TOPPING PA3s is a fully balanced Class D power amplifier--an affordable and efficient option for powering your bookshelf or floor stand speakers. As a balanced amplifier, it powers each incoming channel with a separate amplifier chip. As a Class D amp, it uses far less power than Class A amps, making it super efficient. \nFully balanced Class D amplification\nIn the PA3s, each channel is separately amplified by its own Class D power amplifier chip. By separating the channels, the PA3s achieves greatly reduced crosstalk and better audio performance. Each chip has its own heat dissipation, which extends the lifespan of the amp. \n80W x2 of power\nDrive any bookshelf or floor stand speakers with 80Wx2 of power at 4Ω load. \nBalanced + single-ended inputs\nConnect multiple sources via TRS balanced and single-ended RCA inputs. The balanced input option eliminates potential ground loop problems, providing pristine audio without hum. Either input is selectable using the front panel button, and the PA3s will remember the last input selected when you turn it on. \nProduct highlights\n\n80W x2 @4Ω, THD+N <10%\n65W x2 @4Ω, THD+N <1%\nTwo MA12070 Class D power amplifier chips \nFully balanced amplifier\n<0.004% THD+N\nRCA and TRS inputs\n\nSpecs\n\nSingle-ended input\n\nTHD+N @1kHz (A-wt)\n\n<0.005% @4Ω 5W\n<0.004% @8Ω 5W\n\nTHD @20-10kHz (20kBW)\n\n<0.008% @4Ω 5W\n<0.007% @8Ω 5W\n\nSNR: 107dB\nDNR: 107dB\nFrequency response: 20Hz-40kHz (±0.1dB)\nOutput level\n\n46Vpp@4Ω\n48Vpp@8Ω\n\nNoise (A-wt): <70uVrms\nChannel crosstalk @1kHz: -96dB\nInput sensitivity: 0.92Vrms\nGain: 25.2dB\nChannel balance: 0.5dB\n\nBalance input\n\nTHD+N @1kHz (A-wt)\n\n<0.0045% @4Ω 5W\n<0.004% @8Ω 5W\n\nTHD @20-10kHz (20kBW)\n\n<0.007% @4Ω 5W\n<0.006% @8Ω 5W\n\nSNR: 112dB\nDNR: 112dB\nFrequency response: 20Hz-40kHz (±0.1dB)\nOutput level\n\n46Vpp@4Ω\n48Vpp@8Ω\n\nNoise (A-wt): <70uVrms\nChannel crosstalk @1kHz: -100dB\nInput sensitivity: 1.75Vrms\nGain: 19.5dB\nChannel balance: 0.5dB\n\nOutput po","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108626321579.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621144235.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108620685483.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108620849323.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621078699.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621111467.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621308075.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621242539.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108621177003.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30144131727531.jpg?v=1740196042","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30144061964459.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30144104497323.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108620652715.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108620980395.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30144130973867.jpg?v=1632362661","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-topping-headphone-amp-topping-pa3s-fully-balanced-class-d-amplifier-30108620816555.jpg?v=1632362661"],"price":149,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:00.688Z"},"share_url":"https://firestarter.network/l/lst_DyA4SgEL","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_DyA4SgEL' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy TOPPING PA3s Fully Balanced Class D Amplifier' and a budget_max comfortably above $149.00 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."]}}