Amazon.com: Pyle 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2
5 CORE 8" Full Range Subwoofer Car Audio Speakers, RMS 50W Peak 500W, 4 Ohm Car Vehicle Audio Full Range Drivers, Wide Range DIY Loudspeaker Woofer Replacement WF 890 DBL - Walmart.com
5 Core 8 Inch Subwoofers 50 Watt RMS Raw Replacement Speaker 4 OHM Pro Audio Car Sub Woofer System Powerful Bass Stereo WF 8"-890 1 PCS | Reverb
Amazon.com: BOSS Audio Systems BRS35 3.5 Inch Replacement Car Door Speakers - 50 Watts Max, Sold Individually, Use With Stereo and Tweeters : Electronics