Proficient Reference FRS 12in Subwoofer - Multivoltage

Sunfire HRS-10 10'' Powered Subwoofer (Gloss Black)

Klipsch RP-1200SW Reference Premiere 12" Subwoofer

Velodyne MiniVee Subwoofer 8" Driver 1000 Watts Amp Tested & Works

Rythmik L12 Powered Servo Subwoofer - No Box

Monolith by Monoprice M-12 V2 12in THX Certified Ultra 500-Watt Powered...

Sundown Audio Dual Subwoofer Enclosure Black Wired Rectangular Wood Speaker Box

Bose Bass Module 500 Black Subwoofer (Companion to Bose Soundbar also on Ebay)