{"type":"firestarter.listing","listing":{"id":"lst_vKMXFCxk","product_name":"Singxer SA-2 Fully-balanced Headphone Amplifier","category":"Headphone Amp","description":"Singxer SA-2 Fully-balanced Headphone Amplifier\nThe SA-2 picks up where the SA-1 left off: same pragmatic exterior but with radically upgraded internals. With doubled output power, lower distortion, and improved heat management, it’s a balanced headphone amplifier and preamp designed for those who like their music honest, detailed, and powerful. Whether you’re running high-impedance headphones or sensitive IEMs, the SA-2 delivers the clean current and headroom to drive them all with confidence.\n\nMore power to play with\n\nThe SA-2’s output power boasts 10W into 32Ω, topping out at 15W into 20Ω. That means effortless control and dynamic range even with power-hungry planar headphones. It’ll drive anything down to 8Ω without issue.\nDistortion that barely registers\nCircuit optimizations and a new DC servo design bring the SA-2’s THD+N down to -117dB at 1kHz under an 8W load. \n\nCooler heads prevail\n\nA copper block and aluminum alloy heat sink work together to pull heat away from the circuit. The result is steady thermal performance even when you’re deep into a long listening session.\n\nClass-A sweetness\n\nAt lower loads, the SA-2 runs in pure Class A, delivering that lush, harmonically rich tone that Class-A fans adore. Above 64Ω, nearly all its output power stays Class A, smooth, full, and beautifully controlled.\n\nGain staging done right\n\nWhether you’re using balanced or single-ended sources, the SA-2’s gain options keep things flexible. Choose from low or high gain across configurations for the perfect balance between noise performance and drive power.\n\nUltra-low noise floor\n\nAt low gain, the SA-2’s noise floor measures just 500nV RMS A-weighted (20–22kHz). Even the most sensitive IEMs will stay dead quiet between notes. \n\nGround control\n\nA new GND/LIFT mode switch helps eliminate hum in complex systems. If you’ve ever chased a ground loop through a chain of balanced gear, this small switch will feel like a big relief.\n\nProduct highlights\n\n\nOutput power up to 10W @32Ω, 15W","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395645.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395644.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395643.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395642.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395641.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395640.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395639.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395638.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395637.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395636.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395635.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395634.png?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395633.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395632.jpg?v=1768493533","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-singxer-headphone-amp-singxer-sa-2-fully-balanced-headphone-amplifier-1197395631.webp?v=1768493533"],"price":629,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:57.289Z"},"share_url":"https://firestarter.network/l/lst_vKMXFCxk","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_vKMXFCxk' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Singxer SA-2 Fully-balanced Headphone Amplifier' and a budget_max comfortably above $629.00 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."]}}