Anyone interested in custom audio work in the Dallas/Fort Worth Metroplex area visit Basshedz.comY2K Corvette wheels, same as on my 84' vette:Click here to see my vetteThis is my 91� Z-28. I've built a custom fiberglass box housing 4 Audiobahn twelve�s (AW1200�s). I constructed this box by myself in my garage at home. It was my first and was definitely not my last. I have gained experience and a love for fiberglass! I hope the step by step pics I provide help some of you out there interested in fiberglass. As I stated above, this was my first fiberglass box and I love the way everything turned out. I also hope I encourage anyone who is interested in using fiberglass to construct a subwoofer enclosure. The fiberglass is what made it possible for me to win the battle for airspace. I successfully molded the entire floor of the trunk in order to take advantage of every cubic inch possible, which was the exact volume for the 4 12's! Then I built the box up from there. The box supplies each sub with 1.5 cubic feet of air and a port 3 inches in diameter and 12 inches in length, tuning each chamber to work most efficiently with these subs at 35hz. Low, very clean bass. Did I say low? I meant extremely low.A four channel, 800-watt Precision Power amplifier (PC4800), powers the subs. To eliminate the common, �2 full range channels and 2 low-pass channels� problem with using 4 channel amplifiers, I purchased an Audiobahn bass driver/crossover to �low-pass� the sound before entering the amp, then simply turned off the low pass crossover on the amplifier. So now the amplifier is pumping pure clean bass through all four channels. Also, the crossover came with a small bass remote which I mounted under my dash above the CD player. There I can control bass output level, the boost, and the boost frequency of my crossover from the front of the car. I wired the DVC subs in series/parallel (the voice coils on each individual sub in series, and then the subs to the amp in parallel). After all the bridging and series/paralleling to the DVC�s, I ended up with a 2 ohm load(semi-high current).To maintain power to my amp (and keep my headlights bright at night) I threw in an Audiobahn digital capacitor. Also, I�ve run all 4-gauge power wire.As for my head unit, I have an Alpine CD player and Kenwood equalizer mounted in a custom plate I built out of thin wood and vinyl. My CD player only powers some Vega 4X6's in the dash. Also, for front sound I've built fiberglass door panels to house 2 pairs of 6.5'' Vega components(I pair in EACH door!) powered by half a 400watt lanzar amp. The 6X9�s in the back seat for the rear are Kenwood 4-ways amped by the other half of the amp. For extra treble, I installed a pair of 3/4'' tweeters in the windshield defrost vents.Here's my system diagram:Step by step construction and installation pics of the fiberglass subwoofer enclosure are posted on page 2, on page 3 the fiberglass door panels, on page 4 the head unit and extra pics of the car. . .