pipes

From what your stated goals have been - getting louder and sounding better than a 15" Type R plus utilizing your amps power range - I would personally go with two 12" RL-p's. It would match your power better than any of the 18s your looking at. And you'd only sacrifice a very small amount of cone area to double your power handling capabilities.

So I got an RL-p 18 off a guy on ROE. Decided to try my hand at building a box myself this time. The box is Approximately 6.2 cubic feet net ported to about 27 hertz. I say approximate because it has curved boards and I didn't bother busting out those formulas... So here's some pics. The funny part is, what I thought is/was the toughest part, the curved flares, came out way better than I had hoped they would let alone thought they would. I did the math, drew out where they should end up, then had a friend help me bend them (2 hands simply wasn't enough) and they ended up spot on. All my other easy cuts? Typically a blade's width off.. made for some interesting clamping getting it glued and screwed. Alright, no more delays... Board sliced, partly secured and ready to bend. My bending buddy making some holes to secure it soon as we bend it. Don't have pics of filling the cuts with resin.. didn't have time or hands enough to grab the phone while we were bending it. My clamps. Nothing but the finest equipment. Making sure we're on. Resining up the inside of the curve Fast forward. After finishing the bends I went to work on trying my hand at glassing some kick pods while the flares set. The rest of the work I got done that night didn't turn out well on the camera phone due to lack of lighting. All the picks look like brown blobs. So now the main port board is set, and I'm working on the back port boards going towards the center. 45*s are set ready for the back panel. You can see my saw blade wide off... took some filing work to get the corner to lay flush. Getting close now, ports are all in, one more set of 45s in the middle to flare into the ports and we're on the home stretch. Back 45s are set. I rounded the corner. It creates a flare from about 4.5 inches from the 45s to the end of the board gradually to the 3" port width. Trying to decide where to put the dowel braces. Decided to only go with two. You'll see em in a later pic. The semi-finished product. Still need to do some finish work. Cut the double baffle and laminate it to the top. But, I do believe she's functional as is. A little bit better pic of the interals and the flared port. Well that's the only pics I took that turned out half way decent. I was using a camera phone, so that obviously effected the quality of the pics. I know it's not the prettiest box, but I do think my idea was good and just wish I had been able to execute it that little bit better. However, it's good and solid and no gaps where there shouldn't be. So it'll work. And, of course, the next one will be better! Live and learn. Feel free to make lots of comments; good, bad, ugly... I can handle 'em all. Also, sorry for the side-ways pics. I have every confidence you can deal with it, though!

Thanks, I've got pictures of the woofer already but I don't have time to build the box for a couple weeks. I'll post build pics and whatnot when I get to it! I can't wait to hear it.

Is 81 square inches of port area enough for an RL-p 18? The box I'm thinking of building is sub up ports back(2, with bent-mdf-flares) in the trunk of a 94 cadillac deville. Net volume is about 6.4ft^3 tuned to just under 27hz. The two ports are 3x13.5 and then flared exit. It will only be seeing about 600-700 watts (Crossfire 1502 bridged)