JBL VTX-B28 Arrayable Dual Subwoofer - 18inThe VTX B28 is JBL Professionals next generation dual 18 inch subwoofer, designed to complement the companys flagship VTX full range sound reinforcement systems, and capable of delivering uncompromised low frequency performance, even for the most demanding shows on the planet. The B28 boasts JBL Differential Drive transducers, an exclusive port design, and the same industrial design found in JBLs VTX A Series products. It is equally ideal flown or