Cayin RU6, High-End R-2R Dongle DAC, with Extras, Impeccably New

MANUFACTURED BY ONE OF THE GREATEST ICONS OF INTERNATIONAL HI-FI IN THE HIGH-END SEGMENT. CAYIN RU6 — A SMALL ACOUSTIC JEWEL FEATURING DISCRETE (R-2R) TECHNOLOGY, A TRUE DELIGHT FOR ALL ENTHUSIASTS OF ORGANIC, DISTINCTLY ANALOG SOUND. "WHEN A SMALL DONGLE DAC REVEALS ITSELF AT A LEVEL OF EXCELLENCE COMPLETELY BEYOND STANDARD PARAMETERS!" Ideal for transforming any smartphone into high-end audio equipment. Performance improves in proportion to the USB-C output capability of the device being paired. Even better results are achieved when used with a player supporting bit-perfect playback. This functionality is available on smartphones via the Hiby Music app and must be configured accordingly. The unit has completed its mandatory 300-hour burn-in period; I have consistently observed acoustic improvements, especially after the first 180 hours. It gained greater spatial dimension in soundstage presentation; details became more explicit; bass gained power and significantly improved articulation. After the mandatory burn-in, the Cayin RU6 delivered a true quantum leap across all performance metrics. It has become a wonderfully musical and sweet-sounding device, rich in subtle detail—now highly explicit—delivering the warm, lush tonality of a superb tube amplifier, yet without sacrificing detail—the classic Achilles’ heel of tube-based gear. In bass reproduction, low frequencies became markedly powerful, far more detailed and precisely rendered, extending deeply into impressive sub-bass regions—all while maintaining acoustic coherence, dedicated purely to the unadulterated pleasure of music listening: musical, fatigue-free, with an expansive, deeply layered soundstage that preserves every dynamic nuance, where each instrument sounds distinctly different from the others, always within a refreshingly airy atmosphere. We recommend setting the volume to just 20% during the first 10 minutes of use whenever connecting the unit to another device and keeping it powered on. This is advised by the manufacturer for R-2R architecture devices, allowing power to stabilize across the entire circuit composed of numerous small resistors. Unit is impeccably new—no scratches, no defects whatsoever. At purchase, as documented in the images, the DDHIFI TC05L cable (USB-C to USB-C) is included, replacing the original cable (which remains brand-new and stored in its original packaging), delivering enhanced signal transmission and resulting in a 30% improvement in acoustic quality. Also included in this sale is the original genuine leather case with magnetic closure, designed for convenient, practical use of the unit. Everything is immaculately new. No exchanges accepted! No cash-on-delivery shipments. Fixed price. Brand-new unit, with extras included. Free shipping throughout the national territory, including islands. Shipment will always be made via registered express delivery (CTT Expresso), with hand-to-hand delivery to the recipient. For any questions, please contact me via private message.