{"type":"firestarter.listing","listing":{"id":"lst_cM46F5Zq","product_name":"Singxer SA-2 Class-A Headphone Amplifier & Pre-Amplifier","category":"Headphone Amplifier","description":"The Singxer SA2 is the next-generation evolution of the acclaimed SA-1 V2. It is a high-performance, fully analog Class A headphone amplifier and preamplifier built around a completely balanced and discrete circuit architecture. Compared to its predecessor, the SA2 features a refined circuit design with lower output impedance and a dramatically increased output power, making it suitable for even the most demanding headphones on the market.\nBalanced Design:-\nAs the SA-2 is a headphone amplifier with a fully balanced design concept, it has made the greatest optimization for full balance. Therefore, the best way to use it is : balanced input and balanced output, followed by single-ended input and balanced output.\nSA2 Compared to SA1v2:-\n\nOutput power has been increased from 5.5 watts into 32 ohms on the SA-1 to 10 watts into 32 ohms , with a maximum output of 15 watts into a 20 ohm load . It supports headphones with a minimum load of 8 ohms.\nThrough circuit optimization, ultra-low distortion can be maintained even at high power output.\nMore efficient heat dissipation design, using copper block + aluminum alloy radiator design.\nReduced the impedance of the balanced headphone amplifier output port, enhanced the current driving capability, and provided greater thrust.\nOptimized PCB routing, adjusted the DC bias design of the circuit, added DC servo design.\nAdded GND/LIFT mode switch.\nPure Analog Signal Path:-\nWith no digital control circuitry, the SA2 avoids any EMI interference that could affect the audio signal. High-performance ROHM input transistors ensure ultra-low noise and excellent linearity.\nThe output stage uses a multi-stage current amplification design, similar to what is found in full-size power amplifiers. Each channel is equipped with high-current ON Semiconductor output transistors for very low internal resistance and powerful drive capability.\nTo ensure safe operation, the SA2 includes protection against:\n\nOvercurrent\nOverload\nShort-circuit\nThermal condit","images":["https://cdn.shopify.com/s/files/1/0031/0453/8673/files/singxer-sa-2-class-a-headphone-amplifier-pre-amplifier-headphone-amplifier-singxer-sa-2-892898.jpg?v=1760175469","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/singxer-sa-2-class-a-headphone-amplifier-pre-amplifier-headphone-amplifier-singxer-328018.jpg?v=1760175472","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/singxer-sa-2-class-a-headphone-amplifier-pre-amplifier-headphone-amplifier-singxer-194017.jpg?v=1760175460","https://cdn.shopify.com/s/files/1/0031/0453/8673/files/singxer-sa-2-class-a-headphone-amplifier-pre-amplifier-headphone-amplifier-singxer-254121.jpg?v=1760175462"],"price":566.1,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:28.726Z"},"share_url":"https://firestarter.network/l/lst_cM46F5Zq","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_cM46F5Zq' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Singxer SA-2 Class-A Headphone Amplifier & Pre-Amplifier' and a budget_max comfortably above $566.10 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."]}}