{"title":"Portable \/ Dongles","description":"\u003c!-- HiFiLoop | DACs \u0026 Amps — Portable \/ Dongles Collection Description | Mobile-First Accordion Standard --\u003e\u003c!-- HELP ME FIND GEAR = 帮我找设备 \/ 代客寻货 --\u003e\u003c!-- MAKE AN OFFER = 立即出价 \/ 私聊议价 --\u003e\n\u003cdiv class=\"hfl-collection hfl-dacs-amps-portable-dongles\"\u003e\n\u003cp class=\"hfl-lede\"\u003e\u003cstrong\u003ePortable DAC\/Amps \u0026amp; Dongles: clean drive, zero hassle.\u003c\/strong\u003e This archive covers pocket rigs for phone, tablet, and laptop listening—from ultra-compact dongles to battery-powered portables. Most listings are \u003cstrong\u003epre-owned \/ open-box\u003c\/strong\u003e, documented with unit-specific notes on ports, jack tightness, control feel, and real-world noise behavior with sensitive IEMs.\u003c\/p\u003e\n\u003cp class=\"hfl-ctas\"\u003eIf it’s live, \u003ca data-hfl-chat=\"make_offer\" href=\"#\" class=\"hfl-cta-link\"\u003e\u003cstrong\u003eMAKE AN OFFER\u003c\/strong\u003e\u003c\/a\u003e. If it’s sold out—or you want a quick match for your IEMs\/headphones—\u003ca data-hfl-chat=\"find_gear\" href=\"#\" class=\"hfl-cta-link\"\u003e\u003cstrong\u003eHELP ME FIND GEAR\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv aria-hidden=\"true\" class=\"hfl-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2 class=\"hfl-h2\"\u003eBrowse by\u003c\/h2\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\u003ca title=\"All DACs \u0026amp; Amps\" href=\"\/collections\/dacs-amps\"\u003e\u003cstrong\u003eDACs \u0026amp; Amps\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca title=\"Desktop DAC\/Amps and headphone setups\" href=\"\/collections\/dacs-amps-desktop\"\u003e\u003cstrong\u003eDesktop\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca title=\"Integrated and power amps for passive speakers\" href=\"\/collections\/speaker-amps\"\u003e\u003cstrong\u003eSpeaker Amps\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdetails class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eFor sensitive IEMs: what matters most\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003eWith IEMs, the “silent stuff” matters more than headline specs. A good portable should disappear behind the music.\u003c\/p\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eNoise floor:\u003c\/span\u003e the best matches stay quiet at idle (no hiss, no static, no weird digital hash).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eGain behavior:\u003c\/span\u003e usable volume range matters—especially with high-sensitivity IEMs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eOutput control:\u003c\/span\u003e stable channel balance at low volume is a real quality marker.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"hfl-muted\"\u003eTell us your IEM model and source device—we’ll point you to a clean, practical match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eConnections \u0026amp; daily usability\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eInputs:\u003c\/span\u003e most are USB-driven; some portables include multiple inputs (varies by model).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eOutputs:\u003c\/span\u003e 3.5mm \/ 4.4mm options depend on the unit—check the listing I\/O notes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eControls:\u003c\/span\u003e hardware buttons\/knobs (when present) are noted for feel and stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eHeat \u0026amp; draw:\u003c\/span\u003e compact gear can run warm; we disclose unusual behavior when observed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"hfl-muted\"\u003eIf you need a specific output or connector standard, message us before checkout and we’ll confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eLoop Certified checks (portable focused)\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cp\u003ePortable gear is all about reliability in real use. We focus on practical checks that prevent regret-buying.\u003c\/p\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eOutput sanity:\u003c\/span\u003e verified for stable operation and abnormal behavior that would indicate issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eJack integrity:\u003c\/span\u003e headphone outputs checked for secure retention (no loose grip or intermittent contact).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003ePort condition:\u003c\/span\u003e USB\/charging ports inspected for wear and consistent connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eControls:\u003c\/span\u003e buttons\/knobs checked for consistent actuation (no obvious sticking or skipping).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"hfl-muted\"\u003eWant a specific verification (output type, gain, compatibility notes)? Ask—fast confirmation is part of the service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"hfl-acc\"\u003e\n\u003csummary class=\"hfl-acc__summary\"\u003eShipping \u0026amp; what’s included\u003c\/summary\u003e\n\u003cdiv class=\"hfl-acc__panel\"\u003e\n\u003cul class=\"hfl-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eCondition \u0026amp; accessories:\u003c\/span\u003e what’s in the box is listed clearly (cables\/adapters vary by unit).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eProcessing:\u003c\/span\u003e typically 3–5 business days for inspection and packing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eShipping:\u003c\/span\u003e typically 7–15 days depending on destination and line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hfl-muted\"\u003eDOA window:\u003c\/span\u003e 14 days for arrival functionality issues.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cp class=\"hfl-cta-bottom\"\u003e\u003cspan class=\"hfl-muted\"\u003eTell us your source device + IEMs\/headphones + budget—we’ll match the right portable path.\u003c\/span\u003e \u003ca data-hfl-chat=\"find_gear\" href=\"#\" class=\"hfl-cta-link\"\u003e\u003cstrong\u003eHELP ME FIND GEAR\u003c\/strong\u003e\u003c\/a\u003e \u003cspan class=\"hfl-muted\"\u003e \/ \u003c\/span\u003e \u003ca data-hfl-chat=\"make_offer\" href=\"#\" class=\"hfl-cta-link\"\u003e\u003cstrong\u003eMAKE AN OFFER\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"cayin-ru7-amp-dac-used","title":"Cayin RU7 DAC\/Amp Dongle - Mint - Verified by HiFiLoop","description":"\u003cdiv\u003e\n\u003ch2\u003eThe Audiophile's Hook\u003c\/h2\u003e\n\u003cp\u003eThe Cayin RU7 is a rare breed in the dongle world: a fully discrete 1-bit DAC design built for musical flow, density, and realism—without the “clinical” edge many compact DACs can bring. This is a Mint (99% new) full-set unit, delivering flagship-style tone and drive for less than new pricing.\u003c\/p\u003e\n\u003ch2\u003eCondition Report (The Truth)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMint \/ Collector Quality:\u003c\/strong\u003e Like new with minimal handling marks, ideal for clean desk setups and everyday carry.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNo obvious cosmetic defects observed.\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\u003ch2\u003eSonic Signature \u0026amp; Pairing\u003c\/h2\u003e\n\u003cp\u003eRU7 is designed around Cayin’s discrete 1-bit approach and “All-to-DSD” processing, aiming for a smooth, organic presentation with strong micro-dynamics and an effortless sense of flow. With both 3.5mm and 4.4mm outputs, it’s an easy match for sensitive IEMs and many portable headphones, especially when you want more body and texture on the go.\u003c\/p\u003e\n\u003cp\u003eTo unleash the full potential of this device, we recommend pairing it with gear from our \u003ca href=\"\/collections\/headphones\"\u003eHeadphones Collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Highlights (Mobile-Table)\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDAC Architecture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eDiscrete 1-bit resistor network design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eHi-Res Support\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003ePCM up to 384kHz; Native DSD64–DSD256\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eAll-to-DSD Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eSelectable DSD64 \/ DSD128 \/ DSD256 conversion\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; line-out supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eOutput Power (@32Ω)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eUp to 400mW (4.4mm) \/ 160mW (3.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eVolume Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e100-step discrete resistor volume (3 segments)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eSize \/ Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e66 × 24 × 12 mm; 25 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCayin RU7 dongle DAC\/amp\u003c\/li\u003e\n\u003cli\u003eFull original retail set (box + original accessories)\u003c\/li\u003e\n\u003c\/ul\u003e\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, noise floor, channel balance verified.\u003c\/li\u003e\n\u003cli\u003e📦 Free Shipping: On 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","brand":"HiFiLoop","offers":[{"title":"Default Title","offer_id":47614240751830,"sku":null,"price":129.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7445\/9862\/files\/Used_Cayin_RU7_DAC_Amp_dongle_in_Mint_condition_-_product_photo.jpg?v=1765952465"},{"product_id":"luxury-precision-w2-acg-dongle-dac-amp-used","title":"Luxury \u0026 Precision W2 ACG Special Edition Dongle DAC\/Amp - Excellent - Verified by HiFiLoop","description":"\u003cdiv\u003e\n\u003ch2\u003eThe Audiophile's Hook\u003c\/h2\u003e\n\u003cp\u003eThe Luxury \u0026amp; Precision W2 ACG Special Edition is a “flagship dongle” built to turn a phone into a serious source—black background, strong drive, and tuning presets that let you shape the presentation on the fly. This unit is Excellent (98% new), full set, and includes a clear TPU case—high performance \/ high value, verified by HiFiLoop.\u003c\/p\u003e\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\u003eClear TPU case included.\u003c\/li\u003e\n\u003cli\u003eFull retail set included (box and accessories as shown in the listing photos).\u003c\/li\u003e\n\u003cli\u003eNo obvious cosmetic defects observed.\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\u003ch2\u003eSonic Signature \u0026amp; Pairing\u003c\/h2\u003e\n\u003cp\u003eW2 ACG is designed for low noise and high control, making it a great match for sensitive IEMs and portable headphones alike. The ACG edition adds L\u0026amp;P’s tailored tuning presets (e.g., a more relaxed mode for vocal-centric tracks and a more refined mode for complex orchestral passages), so you can adapt quickly to genre and transducer.\u003c\/p\u003e\n\u003cp\u003eTo unleash the full potential of this device, we recommend pairing it with gear from our \u003ca href=\"\/collections\/headphones\"\u003eHeadphones Collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Highlights (Mobile-Table)\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDAC Architecture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eDual Cirrus Logic CS431xx-series DACs\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;\"\u003e4.4mm balanced + 3.5mm single-ended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eOutput Power (32Ω)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eUp to 230mW (4.4mm) \/ 125mW (3.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDynamic Range \/ SNR\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eUp to 131 dB (published)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDigital Out\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003eS\/PDIF output (shared with 3.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eSize \/ Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #eee;\"\u003e60 × 22 × 12.5 mm \/ 22 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLuxury \u0026amp; Precision W2 ACG Special Edition portable DAC\/amp\u003c\/li\u003e\n\u003cli\u003eClear TPU case\u003c\/li\u003e\n\u003cli\u003eFull retail box and accessories (as shown in photos)\u003c\/li\u003e\n\u003c\/ul\u003e\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: Connectivity, 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","brand":"HiFiLoop","offers":[{"title":"Default Title","offer_id":47668926021846,"sku":null,"price":149.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7445\/9862\/files\/Used_Luxury_Precision_W2_ACG_Special_Edition_portable_DAC_amp_in_Excellent_condition_-_product_photo.jpg?v=1767000807"}],"url":"https:\/\/www.hifiloop.com\/collections\/dacs-amps-portable-dongles.oembed","provider":"HiFiLoop","version":"1.0","type":"link"}