AUDIOPIPE TSCAR6 6" WOOFER, 150 WATTS MAX 75 RMS 4-OHM SINGLE VOICE COIL, Speaker 784644227107 | eBay
Amazon.com: Pioneer 4" Speakers - 4-Inch, 150 Watt, Dual Cone 2-Way Speakers, Set of 2, Model: TS-F1034R
AIYIMA 8 Inch Subwoofer Speaker Woofer 4 8 Ohm 150W High Power Long Stroke Deep Bass Hifi Sound Loudspeaker DIY For Home Theater|Bookshelf Speakers| - AliExpress
Amazon.com: Cadence 6.5 Inch 2-Way Full Range Component Car Speakers, 150 Watts Max Power, 4 Ohms, 60 Watts RMS, 1 Inch Voice Coil Coaxial System Car Audio Loudspeakers IQ65KGE, Pair : Electronics