After thinking Fi had gone out of business..why i dont remember lol...im considering going the single 12in sub route and looked initially at the X series from Fi, but then found the Q series. I plan on going sealed again, I know I know everyone here hates sealed boxes but anyway lol, And the X12 will fit in as small as a .5cu/ft box but the Q ,while more expensive only takes slightly more space. i would probabaly go 1 cu/ft but it lists it as "Sealed box: .8-1.5 High QTScuft". I will admit I do NOT know what high qts means...can someone fill me in? Im sure its simple and all answer will make me sound like a moron but wth lol. I would be looking to go one Q12 dual 1ohm powered by my nine.1 amp at 1ohm...so 1200 watts daily and yes in a sealed box.