The PLA18SBA sub-bass speaker provides high power output with low distorsion, fullrange frequency response and optimizes sound pressure level and suitable for the PLA series speaker systems. The PLA18SBA has many sound reinforcement applications, ideal for a stage monitoring applications such a sidefill, drum or bass monitoring. When operated with PLA8A, PLA10A, PLA12A or PLA15A enclosures, the PLA15SBA is highly suitable for DJ, Club, Theatre or cor-porate (A/V) applications. Typical applications inculude ninght club, distributed sub-bass systems for disco, bar, clubs, theatre, conferance rooms or multimedia installations.