Nu Republic Replay Cube – 12W Portable Wireless Speaker | Replay Your Vibe. Meet the Nu Republic Replay Cube, the portable wireless speaker that proves great sound comes in a compact package. Designed with a bold cube form factor and powered by 52mm Dynamic Drivers, Replay Cube delivers deep bass, crisp vocals, and immersive sound wherever you go. Whether you're relaxing at home, hanging out with friends, travelling, or working at your desk, Replay Cube keeps your music alive with up to 8 hours of playback on a single charge.