The BOSE's ROOMMATCH RMS218 VLF-subwoofer was created to extend Bose® RoomMatch arrays' low-frequency response down to 25 Hz. This passive speaker has dual Bose LF18 18-inch high-excursion woofers and a V-baffle design that minimises enclosure width while reducing distortion. For stable ground-stack applications, the sturdy Baltic birch enclosure with 2-part polyurethane coating interfaces with all RoomMatch modules. Create RoomMatch 4-way systems by combining the RMS218 VLF-subwoofer with the RMS215 subwoofer and full-range modules.