I wanted 2 ohm impedance but was sent 4 ohm impedance subwoofers. When I tried to fix this issue even before the subwoofers were shipped I was simply told that I could order 2ohm next time... I haven't hooked the subs up to a amplifier yet due to the wrong ohm load. I will do an extended review, based on longevity of the subwoofers at there rated power level.