The OMNITRONIC BOB-4 Top 16 Ohm is a passive pair of satellite loudspeakers for BOB series systems. Each cabinet uses a 4-inch full-range speaker and a 1-inch compression tweeter, with a nominal impedance of 16 ohms and 75 W RMS power handling. The speakers provide a 150–16,000 Hz frequency range, 90 dB sensitivity, 109 dB maximum SPL and 120° × 120° dispersion. Each enclosure includes a mounting bracket and has a black ABS housing with a metal grille and acoustic foam.