1. PS-25 long range speaker, dual 15 inch speaker,sound system for hall. 2. Usage: conference room, theater, church, ... club etc. long range speaker, dual 15 inch speaker,sound system for hall.1. PS-25 is 2-way system ... suitable for the dramaturgic place and night club, bar background music multifunctional sound systems. Specification ModelPS-25Frequency response40Hz-18KHzSpeaker unitLow 15"X2 ...