If anyone is considering purchasing this subwoofer please don't hesitate to do so.
My first system I had dual kickers, and I was partly disappointed in their performance. I was in band in high school. Hearing different genres of music I don't think it responded adequately to all the frequencies. Now obviously disconncting from the power terminal I knew my system wasn't on. But I wasn't getting a full representation of the music.
My subs got stolen and I purchased this subwoofer, connected at 4 ohms, for 600 RMS (amplifier) output I am loving it's performance. For a subwoofer test song ( I like futures molly percocet song) I was extremely impressed. For all else, mainly I like soft rock and adult alternative (36 alt nation is nice), I can hear the music as it was meant to. Also It is less expensive and outperforms the more expensive subs in my opinion.