Amazon.com: Eminence ALPHA38 3 Inch 8Ohm MID Bass Woofer 60W, Black : Musical Instruments
Amazon.com: 5 CORE 8 Inch Car Subwoofer Paper Cone, Black, Voice Coil 4 Ohm Impedance, 1000 Watt Power Audio Speakers, Vehicle Audio Full Range Drivers, Loudspeaker Woofer Replacement : Electronics