gpcaraudio.com
I would look at the American Bass Hawk series subs a Pair of DVC4 Ohm subs or even a pair of XFL Series be my 2nd Choice if you want to Slamm and look at a CT Sounds CT3200.1 with the Supply for the demand and get them tuned towards 31Htz. GP Audio has a Tuned enclosure for those. You can simply Call and speak to them opon your Goals for the enclosure and what sub you would like to use and they will recommend the enclosure and build a Glue and screw it enclosure shipped with everything Labeled with a diagram of each piece to put together. just takes a Phone call. Sometimes It takes a little patience to get what you want out of the things you need/want.So what do you recommend other than the super expensive and well used JLs? I want this to slam. Hard. I want to be able to get at least 130dB from this system. 140 preferably. The most I have ever gotten is MAYBE 120.
lazercaraudio.com
I can Most Deff Vouch for the Hawk 15s in 8.0Cuft @ approx 33 Htz on 3k. They are quite impressive for the $ spent. Im even thinking about ditching my 4-XFL 12s and buy 4- Hawk 12 and use on my last SPL Build out to be honest. I wouldnt expect any less from the 12s performance than Ive experienced with the 15s for the $. Impressed to say the LeastWell, I'm not an expert on SPL, always more of an SQ/SQL person. I do know physics pretty well. If you want outrageous volume, you use the subs you have, feed them 6-10000 watts in a 5.5 cu ft box, tuned to around 34-37 hz, even louder at around 63 hz. You don't get both without paying, A LOT! Everything has it;s forte and most things are mutually exclusive unless you pay a boatload of money to accomplish both. you may want to consider going to a couple of 15's too. 140db is pretty lofty for subs under a grand each, it's the dollars to watts ratio, not in your favor. Tuning is consideration also, SPL subs are often tuned inthe 60hz region too, not a great sound but it gets loud.
There are many in here that will suggest alternatives, but here are a couple:
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MESO-12 // 1500 Watts RMS 12 Inch Car Subwoofer
The CT Sounds MESO-12 is a 12-inch car subwoofer capable of reaching 3000-watt max power. Available in dual 2-ohm and dual 4-ohm coil configurations.www.ctsounds.com
ina 1.5 cube box tuned to 37hz
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10D4 1500 RMS - Lazer Car Audio
If you're into gut wrenching bass during the week and competitions on the weekend then the LAZER PHASE THREE Subwoofer Series is just right for you. White powder coated Strong cast aluminum frame, CNC large vent motor structure, Free Flow Cooling System, double stacked Y-35 ferrite 100 oz...lazercaraudio.com
THis is also a great "loud'sh" sub:
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HAWK 15″ Car Subwoofer | 1500 Watts RMS | Dual Voice Coil 4 Ohm
American Bass Hawk 15-inch car subwoofer delivers 3000W max power, 1500W RMS, dual 4 ohm voice coils, and SPL-ready bass performance.www.americanbassusa.com