rockford fosgate r1s4-10 prime 10" 400w 4 ohm impedance svc car audio subwoofer sub pair w/ 2 gauge compression speaker connector & polypropylene cone rockford fosgate this pair of rockford fosgate r1s410 10" 400 watt 4 ohm prime series subwoofers offer great rockford fosgate performance! a stamped steel frame, parabolic polypropylene cone, quick release 12 gauge compression terminals, anodized aluminum voice coil former, and single voice coil design highlight these r1s410 subwoofers. they are also cea 2031 compliant and are best optimized for sealed enclosures. we are an authorized rockford fosgate dealer