{"product_id":"cayin-c9-portable-headphone-amplifier-used","title":"Cayin C9 Portable Headphone Amplifier - Excellent - Verified by HiFiLoop","description":"\u003cdiv\u003e\n  \u003ch2\u003eThe Audiophile's Hook\u003c\/h2\u003e\n  \u003cp\u003e\n    The Cayin C9 is a true flagship portable headphone amplifier built for “choose-your-flavor” listening: switch between Tube and Solid-State timbre, then fine-tune with Class A \/ Class AB to match your headphones and mood.\n    This Excellent (98% new) bundle delivers reference-grade drive and flexibility at used-market value—verified by HiFiLoop.\n  \u003c\/p\u003e\n\n  \u003ch2\u003eCondition Report (The Truth)\u003c\/h2\u003e\n  \u003cp\u003e\u003cstrong\u003eExcellent \/ Well-Cared For:\u003c\/strong\u003e Very clean overall, lightly used, and handled with care.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eBare unit bundle (no retail box unless shown in photos).\u003c\/li\u003e\n    \u003cli\u003eNo obvious cosmetic defects observed.\u003c\/li\u003e\n    \u003cli\u003eIncluded: two interconnect cables + USB-C charging cable + battery set.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eMandatory:\u003c\/strong\u003e The device has passed all functional tests.\u003c\/p\u003e\n\n  \u003ch2\u003eSonic Signature \u0026amp; Pairing\u003c\/h2\u003e\n  \u003cp\u003e\n    C9 is all about control and customization. Tube mode adds a more organic bloom and dimensionality, while Solid-State keeps edges tight and images sharply outlined.\n    Class A emphasizes density and smoothness; Class AB leans punchier and more efficient—ideal for longer portable sessions.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    To unleash the full potential of this device, we recommend pairing it with gear from our \u003ca href=\"\/collections\/headphones\"\u003eHeadphones Collection\u003c\/a\u003e.\n  \u003c\/p\u003e\n\n  \u003ch2\u003eTechnical Highlights (Mobile-Table)\u003c\/h2\u003e\n  \u003ctable style=\"width:100%; border-collapse: collapse;\"\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eTimbre Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eTube (dual KORG Nutube 6P1) \/ Solid-State\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eAmplifier Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eClass A \/ Class AB (instant switching)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e3.5mm single-ended + 4.4mm balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e3.5mm single-ended + 4.4mm balanced (supports BAL↔SE optimization)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003ePower System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eRemovable battery module; 4× user-replaceable 18650 cells\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eCharging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eUSB-C charging\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e160 × 80 × 28 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eCayin C9 portable headphone amplifier (bare unit)\u003c\/li\u003e\n    \u003cli\u003ePortable interconnect cable(s) (as included in your bundle)\u003c\/li\u003e\n    \u003cli\u003eUSB-C charging cable\u003c\/li\u003e\n    \u003cli\u003eBattery set (4× 18650 cells)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eWhy Buy Used from HiFiLoop?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e✅ 14-Day DOA: Full refund\/replace if dead on arrival.\u003c\/li\u003e\n    \u003cli\u003e🔧 180-Day Warranty: Free repair service (buyer pays return shipping).\u003c\/li\u003e\n    \u003cli\u003e🔬 Lab Tested: I\/O integrity, noise floor, and channel balance verified.\u003c\/li\u003e\n    \u003cli\u003e📦 Free Shipping: Orders over $199.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eSee full Grading Scale in Footer Condition Guide.\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eCTA:\u003c\/strong\u003e Missed this? Contact “Help Me Find Gear”.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"HiFiLoop","offers":[{"title":"Default Title","offer_id":47684091085014,"sku":null,"price":709.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7445\/9862\/files\/Used_Cayin_C9_portable_headphone_amplifier_in_Excellent_condition_-_product_photo.jpg?v=1767063811","url":"https:\/\/www.hifiloop.com\/products\/cayin-c9-portable-headphone-amplifier-used","provider":"HiFiLoop","version":"1.0","type":"link"}