{"product_id":"ds-audio-grand-master","title":"DS Audio Grand Master Optical Cartridge","description":"\u003cp\u003eThe Grand Master is DS Audio's flagship below the Grand Master EX, the successor to the Master line, and the first DS Audio cartridge to pair a diamond cantilever with a Micro Ridge stylus.\u003c\/p\u003e\u003cp\u003eIt shares the beryllium shading plate and Ultra Duralumin body of the Master 3, but its equalizer and power supply are fully separate units built with custom film capacitors, non-induction winding resistors, and large capacitor banks, with three transformers each rated 1.5 times more powerful than the original Master's.\u003c\/p\u003e\u003cp\u003eDS Audio cartridges are optical rather than moving coil or moving magnet: LEDs shine through a shading plate on the cantilever, and the stylus's movement in the groove modulates the light reaching a pair of photodiodes, generating the signal directly with no coil and no magnet. The output is not a standard RIAA phono signal, so it requires a matching DS Audio equalizer rather than an ordinary phono preamp — the equalizer also powers the cartridge's LEDs over the same cable.\u003c\/p\u003e\u003cp\u003eEqualizer-alone pricing is not published; call to confirm before ordering an equalizer on its own.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCartridge\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eGrand Master Equalizer\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003ePricing not published separately — call to confirm\u003c\/li\u003e\u003c\/ul\u003e","brand":"DS Audio","offers":[{"title":"Cartridge Only","offer_id":67605466087741,"sku":"DSA-GM-CART","price":16500.0,"currency_code":"USD","in_stock":true},{"title":"Equalizer Only","offer_id":67605466120509,"sku":"DSA-GM-EQ","price":0.0,"currency_code":"USD","in_stock":true},{"title":"Cartridge + Equalizer (System)","offer_id":67605466153277,"sku":"DSA-GM-SYS","price":60000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1021\/5741\/8813\/files\/image_8dec738b-8977-4f29-a464-07e9bb39a1c2.jpg?v=1790796557","url":"https:\/\/audio-concepts.com\/products\/ds-audio-grand-master","provider":"AudioConcepts","version":"1.0","type":"link"}