Electro-Voice EVOLVE 70 15-Inch Subwoofer (White) with CordThe EVOLVE family is a proven leader in portability and the EVOLVE 70 follows this tradition. Advanced materials combined with ergonomic design principles have been used throughout the system, ensuring that the acoustic performance exceeds customer expectations while also being the lightest and most portable model in its class. Powerful 15 Inch Subwoofer Delivers deep, impactful bass down to 35 Hz for high energy performances. Laminar Flow Vent Design