A Dongle Done Right: Why the Cayin RU3 Earned a Spot in My Rotation Pros: * Excellent sound quality for the price, clean, natural, and well balanced * Strong output power, confidently drives planar IEMs and full size headphones * Solid CNC aluminum build with a premium feel * Responsive UI with no lag or hiccups * Clear OLED display and intuitive button controls * Well-implemented Cayin Control app with lossless EQ * 3.5mm and 4.4mm outputs with PO and LO support * Broad compatibility across Android, iOS, Windows, and macOS Cons: * Included USB-C cable is a bit stiff for pocket use * Runs slightly warm in Hyper mode * Small display and tiny font may be hard to read for some users I’ve been spending a lot of time lately with the Cayin RU3 paired to my current favorite planar IEM, and the longer it stays in my rotation, the more it continues to surprise me. This is one of those pieces of gear that quietly wins you over. No big first-day fireworks, just a steady realizat...