trial and error
Since the summer of 90, meet a fella that had an acord with 4-15's in a honda accord hatch back, shit was all crammed in there, he had horns and tweets built into his box. most likely prefab, his subs were redlines, and he had a few small punch amps, shit was crazy loud to me back then, then i caught a glimps of Mark Fakuda's balzer with 8 -15 inch punch. I havent stopped fooling with car stereo ever since. just amazing what the hobby has turned into. At one point when i was 16 i even installed 2 10s in my moms little ass ford escort station wagon, she was pissed but all my friends thought it was the coolest shit ever.