Not that I'm a veteran around here or anything but I think people should stop asking "which is louder?" those questions are just annoying and honestly really hard to answer because of the variables involved. If you want a real answer provide more info like, the space you have available, the money you can spend, your abilities in building a box, and since you only care about SPL you should really be asking what frequency you should tune to. If you just want a hella loud box that doesn't sound very good make a bandpass box or a really large ported box with a huge slot and tune that bastard to like 50hz or something. It'll just crush at that freq. but everthing else will sound awkward. Is your electrical system up to the job? As far as my recs for the above listed the 2rlp's will blow the others away in SQ and most likely SPL but I'm not sure on the SPL (but theoretically they shouldn't be far off) My rlp 12 can easily make my amp clip in a 1.2 cuft sealed off of 600watts. So with 1000 watts you might not really see the full potential of your subs. later, b <{POST_SNAPBACK}> ok then I have a 94 acura vigor which has good trunk space but my box buliding skills suck so I'm gonna buy a 1.8 cubic foot ported box off ebay 1 for each sub because I can't fit a dual because of the akward shape of the trunk lid my budget is not really an issue because I am not willing to purchase another amp so thats the wattage (500 per sub) (or 1000 for 1 sub) I have to work with and I have an optimua yellow top battery and monster 1 farad cap running 0 guage wire you tell me what frequency I should ask for like I said I have no box buliding skills so I have no clue about frequency
