Amazon.com: Pyle 6.5 Inch Mid Bass Woofer Sound Speaker System - Pro Loud Range Audio 300 Watt Peak Power w/ 4 Ohm Impedance and 60-20KHz Frequency Response for Car Component Stereo PLG64,Yellow : Electronics
2 PCS LOT Sounderlink Audio Labs 3'' 25W subwoofer woofer bass speaker driver 3 inch 30W Full range|speaker driver|audio labsbass speaker - AliExpress
American Bass XMAXXX 12" 3500w RMS Subwoofer - 1800woofers.com
DD AUDIO 1108-D2 8" USA MADE WOOFER 800W DUAL 2-OHM SUBWOOFER BASS SPEAKER NEW | eBay