Dayton Audio SA25 25W Subwoofer Plate Amplifier - Tested / Working - Max Marine Electronics
GHXAMP 3 inch Woofer Subwoofer Speaker 4ohm 25W Hifi Square Bass Speaker Black Alumina Ceramic Cap Rubber Edge 2pcs - EveryMarket
2Pcs 3 Inch Portable Audio Bass Speaker 8 Ohm 25W Home Theater Hifi Stereo Woofer Speakers Subwoofer Loudspeaker Horn(Square 8 Ohm Speaker) Home Audio Speakers - Newegg.com
Logitech Z313 Computer Speaker System with Subwoofer
2pcs 3Inch Subwoofer Bass Speakers 4ohm 25W 3" For Portable bluetooth boombox | eBay
ARCHEER 25W Bluetooth Home Speakers with Huge Bass and Superior Stereo 2.1 Channel Sound from 10W Drivers and 15W Subwoofer | Headphone Reviews and Discussion - Head-Fi.org