Experience- i havent done anything lately, but back in the day i built several boxes sealed and ported. Had various 12's finally ending up with jl's. Put systems in my car(1984 grand prix w/ t-tops ) and my truck, 79 ford.(still have both if them!) always tinkering with both if them. Installed everything myself, the grand prix looked nice and clean. The truck had a bunch of different stuff at any given time but i didn't spend as much time on truck.