I'm a big fan of KICKER and MTX. They both offer great products at reasonable prices. The average person wanting to upgrade the stereo in their daily driver will be very happy with them.
I've installed my share of Kicker subs from comps to L7's, 8's to 15's and they all kill in sealed boxes. Yes there are some benefits to using a ported box. There are also benefits to using a sealed box they are cleaner, tighter, and plenty loud in sealed boxes. Putting these subs in a sealed box is perfectly acceptable you wont hurt them and you wont be disappointed. That's one loud setup you're working on.
As for the Jackhammer amp no its not the best series of MTX amps but they are great for the price. The monoblock amps are D class and have fans in them it should be fine under the seat. I hope you got the JH1200 as it will run at 1ohm and have enough power for those subs.
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 STILLEN G3 / F.I. TDX (NO RESONATORS) / F.I. LTH / UpRev Tuned / BC-Racing ER Coilovers / DIY Oil Cooler / Short Shifter
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