FOCAL 33V2 13" SUB 800W DUAL 4-OHM POLYGLASS SUBWOOFER CLEAN BASS SPEAKER NEW | eBay
2 Haut-parleurs Compatible avec PHONOCAR SELECTION 02085 woofer 16,50 cm 165 mm 6,5" diamètre 70 Watt rms 180 Watt Max 4 ohm 91 DB Voiture, la Paire : Amazon.fr: High-Tech
2) FOCAL SUB P25 10" SUBS 800W MAX 4-OHM CAR AUDIO SUBWOOFERS BASS SPEAKERS NEW | eBay
2 Ohm Vs 4 Ohm Subwoofers – Which Is Better?
How to Wire Two Dual 4 ohm Subwoofers to a 4 ohm Final Impedance | Car Audio 101 - YouTube