Ground Zero GZHW 25XSPL-D1-YELLOW 10″ high quality SPL subwoofer – Droppin HZ Car Audio
DS18 EN-DF10A 10" Amplified Shallow Down Firing Subwoofer Enclosure 50 – Droppin HZ Car Audio
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