Veleno, they still make the power series. The power hx2 series. The 10",12", and 15" are all 1000watts rms and 2k peak. One 12" or 2 10"s would sound awesome in an nsx. If you have or get aftermarket seats that can be moved up some you would have a little more room to work with,they make pretty good components too. Also mount your amps in the rear compartment,great for shows! Id check out audiobahn,there great also mmats juggernaut series,you might be able to get a 10" in there. Fosgate is good,and many times is called the best for the money but they arent the best. They just broke a record with 175.2 but that took 12 woofers and alot of power from 48 amps. MMATS only had 8 woofers and 16 amps and got 174.7. I think thats much better performance. If they put another amp on each sub or added more subs,tuned the box,etc... they could beat fosgate easily. JL is the best for the money to me. For the nsx id get the best period and Id get it for sq not spl,there is a big sound difference. If you want some loud music to sound good dont get some measily aftermarket piece of crap sub to put in the floor or behind your seats,get something good. Show pics too.
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Racer