The OMNITRONIC PAS-151 MK4 is a passive 15-inch bass-reflex subwoofer for low-frequency sound reinforcement. It has a 700 W RMS rated power handling, 40–200 Hz frequency range, 96 dB sensitivity and 128 dB maximum SPL, with an 8 ohm nominal impedance. The enclosure is constructed from glued multilayer plywood and includes a black metal grille with acoustic foam and two recessed carrying handles. It provides an M20 flange thread and two speaker inputs.