Product Name: Double 18inch Powerful Subwoofer Box (KS28) Model NO.: KS28 Application: Commercial Speaker Material: Wood Activity: Passive Trademark: VEMA Transport Package: Foam+Carton Packing Origin: China HS Code: 8518210000 Product Description Double 18inch subwoofer speaker box1. Using high quality plywood2. High quality painting3. 2pcs 18inch woofer inside4. Matching up with the line array to use can create a powerful effect.5. suitable for all kinds of outdoor performance etc