Thanks for all the replys, I'll clear up some blank spots for those who have questions. Don't be hatin' but I have a 2006 Kia Spectre, got it for $2500 from my mom and with the gas prices and shit I couldn't turn down that offer. Idk what alternator it has but I already replaced the stock battery (it was 5 years old and kept dying on my current 300 watt system). I don't have a big 3 or anything and I doubt an aftermarket alt would fit in my small ass car. Also, I had my eyes set on the DC level 2 because of its low rms, cheap price, and it has a very reliable company name behind it. What I was asking for in short is a good 15" sub that can handle full tilt everyday (after break-in period) and run hard on under 600 rms. What I'm mainly looking for is some beast ass lows, I download stuff like Decaf and then slow it down ever further. My comment about getting one 15 or two 12's is because I don't know which of the two would produce deeper/stronger low end in my 4cu f max enclosure size.