Sennheiser EW 100 G4-Ci1-B (626 - 668 MHz) - Wireless System for Guitar & Bass The Sennheiser EW 100 G4-Ci1 is a simple-to-install rackmount wireless system that provides bass and guitar players playing in small to medium-sized venues like concert stages, places of worship, theatres, and clubs with dependable, high-quality wireless...