{"type":"firestarter.listing","listing":{"id":"lst_tm870BbV","product_name":"GUSTARD A20H / XMOS PCM/DSD USB DAC Double AK4497 Headphone Amplifier","category":"DAC Decoder","description":"Geshide /GUSTARD - A20H  XMOS USB PCM/DSD DOP DAC Decoding Machine Double AK4497 Headphone Amplifier\n\n\n\n\n\nHighlight\n\n1.  Dual AK4497 class A full balance amp,native full balance.\n\n2.  Decoder and amplifier all-in-one ,well proportioned,double power supply design.\n\n3. Clock management ,2nd PLL digital plastic,DOP demodulation/modem,PCM/DSD depop switch and other exclusive technology.\n\n4. All interfaces support DSD decoding,digital broadcasting,USB supports 384K DSD256.\n\n\n\nTechnical features\n\n1. The latest hi-end AKM AK4497EQ decoding chips, make no interference in L/R channels and purer sound\n\n\n\n2.  Clock management ,2 nd PLL digital plastic,DOP demodulation/modem,PCM/DSD depop switch and other exclusive technology.\n\n\n\n3.  Using full discrete component large current hi-end full-balanced amplifier,each channel uses two separated amplifier unit to form asymmetric output circuits.\n\n4.  Native full balance architecture, there is no any transition from DA to amp circuits,it is a complete four-way output volume.\n\n5.  Using two customized 50w audio specialized ring transformers to supply power separately to the amp and decoder,so that their power supply has no interference to each other.\n\n6.  Using own-created individual analog LPF cirtuits,the parameters of each level has been carefully adjusted to achieve the best conditions.\n\n7.  The all interfaces support DSD decoding :IIS supports DSD64,DSD128,DSD256,DSD512 decoding; SPDIF,Optical,AES/EBU support DSD64 decoding(DOP mode); USB supports SD64,DSD128,DSD256 decoding.\n\n8.  Rich digital filtering,two kinds of DSD: Wide BW/Narrow BW;six kinds of PCM: Short Delay Shar p / Short Delay Slow / Shar p / Slow / Low-dispersion Short Delay Filter/ Super Slow.\n\n9.  Adjustable screen brightness:it will return to the default brightness after 30s’no-operation;it will automatically remember the current brightness,and the next time you start up, it will keep the last setting.\n\n10.  The USB uses the USBAUDIO specialized U8 chip from XMOS,it","images":["https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-double-ak4497-headphone-amplifier-dac-decoder-hifigo-silver-682327.jpg?v=1648886041","https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-dop-decoder-machine-double-ak4497-hifigo-798516.jpg?v=1648531908","https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-dop-decoder-machine-double-ak4497-hifigo-232919.jpg?v=1573285116","https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-dop-decoder-machine-double-ak4497-hifigo-416939.jpg?v=1573285116","https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-dop-decoder-machine-double-ak4497-hifigo-503934.jpg?v=1573285116","https://cdn.shopify.com/s/files/1/0031/0453/8673/products/gustard-a20h-xmos-pcmdsd-usb-dac-dop-decoder-machine-double-ak4497-hifigo-538243.jpg?v=1573285116"],"price":752,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:31.891Z"},"share_url":"https://firestarter.network/l/lst_tm870BbV","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_tm870BbV' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy GUSTARD A20H / XMOS PCM/DSD USB DAC Double AK4497 Headphone Amplifier' and a budget_max comfortably above $752.00 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."]}}