M-Audio GSR18 500W 18" Active Subwoofer 9900-60004-00 B&H Photo
M-Audio
Amazon.com: M-Audio BX4BT 4.5" Bluetooth Studio Monitors, HD PC Speakers for Recording and Multimedia with Music Production Software, 120W, Pair : Musical Instruments
Genuine BMW - 65137894047 - Subwoofer (65-13-7-894-047)