PYLE 6 in. 600-Watt Max Dual Voice Coil 4-Ohm Car Stereo Audio Power Subwoofer (3-Pack) 3 x PLPW6D - The Home Depot
BOSS Audio Systems B69LED Elite Series 6 x 9 Inch Car Audio Door Speakers - 500 Watts Max, 3 Way, Full Range, Coaxial, Sold in Pairs, Hook Up To Stereo and Amplifier, Tweeters
Audiopipe TSCVR6 TSCVR Series 6-1/2 inch Subwoofer - Dual 4 ohm voice coils