Just finished putting together my DIY home subwoofer. I used a Soundsplinter RL-p15 DVC2 and an Oaudio Bash 500 watt amp...... the box is 4.6 cf gross, 3.2 cf after port/bracing/speaker deductions. The box is made of 1.25" mdf and oak vaneered. The port is 2.25" x 16" and 43" long tuned at ~24hz. Mike at Soundsplinter and Todd at Oaudio are two of the greatest people and are willing to help in anyway possible. Also, I can't say enough good about their products!!! I tested the sub on Pearl Harbor and the Japanese attack scene almost brought down the walls..................