i have a quick question about the XXX. from what i hear its a great SQ sub and also will get loud. the main thing i want is SQ but i also want it to get loud. how would u compare the loudness of the XXX to others. like will it get as loud as a kicker L5 etc. also about the RE SX. i hear this sub is mostly SPL. which is louder the SX or XXX? and what about the SX's SQ. im trying to find some answers before i make a purchase.. in the long run would it be worth spending the extra dollar to get the XXX over SX?