JBL VTX-B15 Compact Arrayable Subwoofer - 15inThe VTX B15 Compact Arrayable 15 inch Subwoofer extends the low end performance of VTX full range sound reinforcement systems, including the VTX A6 Subcompact Dual 6. 5 inch Line Array Element. The B15 is a versatile solution for production companies, touring acts, rental houses, theaters, houses of worship or anyone who demands superior sound reinforcement when space is at a premium. The B15 joins the VTX B Series subwoofer family in harnessing VTX