spencer321 10+ year member
CarAudio.com Elite
NS is even better, they require less space than any other 18 i've seen, you can bring the height down a bit. for instance. You can do 60" long, 11" deep, 18.5" tall, if you use a single 8" sono-tube port @ 17.5" long assuming .5 ft^3 for sub displacement and bracing, makes for 5 ft^3 @ 34hz