Amazon.com: Mackie THUMP Series, 18-Inch 1200-Watt Subwoofer with Professional band-pass design Dual XLR inputs Stereo high-pass and Stereo full-range outputs - Black (THUMP18S) : Electronics
Mackie SR18S 18" 1,600W Professional Powered Subwoofer Black - Walmart.com
Mackie SWA1501 Active Subwoofer System at Gear4music
Amazon.com: Mackie MRS10 10 120W Powered Active Studio Subwoofer Sub Bundle with Rockville ISO 10-12 Isolation Platform Acoustic Riser Pad For Subwoofers & RCM PRO Studio/Recording Condenser Microphone (3 Items) : Everything Else