The PS-850 is a passive double 18" subwoofer from Fohhn's Perform series, featuring direct radiating vented enclosure design with Non-Turbulent-Port technology. It utilizes two 18" long-excursion drivers with 4" voice coils and water-resistant cones, delivering a nominal power handling of 2000 W and maximum SPL of 142 dB. With a cut-off frequency of 27 Hz and 4 Ω nominal impedance, it's engineered for high-output low-frequency reproduction in live sound applications. Constructed from high-quality multiplex birch plywood with scratch-proof PU coating, it includes dual Speakon connectors front and rear for cardioid configurations, steel-reinforced rigging slots, and M20 thread for distance rod mounting. Suitable for horizontal/vertical arrays and cardioid setups, it weighs 110 kg without rigging system and measures 1200 × 600 × 900 mm.