WF SERIES loud speaker waterproof outdoor power Aluminum Horn *Heavy-duty Aluminum Speaker Horn,thickness is 1.3mm *Can be in combination with our driver unit *Waterproof *Aluminum Horns are suitable for PA system *Advanced technology, excellent quality and perfect service Specification Model Dimensions WF-18 Φ 450*350 MM WF-20 Φ 500*370 MM WF-21…