{"type":"firestarter.listing","listing":{"id":"lst_VKAMX3v5","product_name":"Audalytic HP70 Fully-Balanced Discrete Headphone Amplifier","category":"Headphone Amp","description":"Discrete Class A headphone amp and preamp\nThe AUDALYTIC HP70 is a desktop headphone amplifier built around a fully-balanced discrete Class-A design, four pairs of power MOSFETs, R2R relay volume control, and flexible preamp operation. With 4.4mm balanced and 6.35mm single-ended headphone outputs, XLR and RCA inputs, XLR and RCA preamp outputs, adjustable gain, and remote control support, it gives headphone listeners and desktop speaker users a serious analog control center without turning your desk into a mess. \nClass-A amplification with discrete control\nThe HP70 uses a fully-balanced discrete Class-A amplifier circuit with four pairs of power MOSFETs for tons of driving power for demanding headphones. A discrete design uses individual circuit components instead of relying on a single integrated amplifier chip.\nBalanced performance from more than balanced inputs\nThe HP70’s input stage uses a fully-balanced topology, with single-ended to balanced conversion for RCA sources. That means you can connect a standard RCA source and still benefit from the amplifier’s balanced internal signal path. \nRelay volume control for four-channel precision\nThe R-2R relay volume system provides precise level adjustment while maintaining consistent channel matching across all four paths. This matters most at lower listening levels, where small left-right imbalances can become noticeable. Instead of relying on a basic analog pot, the HP70 uses a relay-based approach designed for cleaner, more stable volume steps.\nPreamp mode for speakers and headphones\nThe HP70 can work as a dedicated pure preamplifier by disabling the post-amplification stage. It includes two socketed LME49720 dual op-amps in the preamp section and switchable preamp output for moving between headphone and speaker use. Keep it at the center of a desk system, then send signal to powered speakers or a power amp when you're not using headphones.\nPower supply designed to keep noise down\nA built-in 30VA low-noise power suppl","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248590.png?v=1778275269","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248588.png?v=1778275208","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248610.jpg?v=1778275149","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248609.jpg?v=1778275089","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248608.jpg?v=1778275033","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248607.jpg?v=1778274970","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248606.jpg?v=1778274910","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248605.jpg?v=1778274853","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248604.jpg?v=1778274791","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248603.jpg?v=1778274729","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248602.jpg?v=1778274669","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248601.jpg?v=1778274608","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248600.jpg?v=1778274551","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248599.jpg?v=1778274488","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248598.jpg?v=1778274430","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248597.jpg?v=1778274370","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248596.jpg?v=1778274309","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248595.jpg?v=1778274250","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248594.jpg?v=1778274191","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248593.jpg?v=1778274129","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248592.jpg?v=1778274068","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248591.jpg?v=1778274010","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248589.png?v=1778273953","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248611.png?v=1778273890","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237269117.jpg?v=1778286189","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237269119.jpg?v=1778286130","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237269118.jpg?v=1778286071"],"price":349,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.800Z"},"share_url":"https://firestarter.network/l/lst_VKAMX3v5","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_VKAMX3v5' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Audalytic HP70 Fully-Balanced Discrete Headphone Amplifier' and a budget_max comfortably above $349.00 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."]}}