Both options aren't going to be that loud. but If I was to say 1 then the 5500s in the thunder box...if I remember correct, they're tuned a little higher(around 38hz i believe(?)) so they will hit harder with twice the cone area then a Type R. Or do a 15" Type R with 1200w and call it a day!//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif