Use the sandpaper to sand down the edges of the cut hole. Cut the PVC to the desired port length using a hand saw and file its ends using sandpaper. Insert the PVC into the hole and use your heat gun to flare the opening of the PVC pipe. You can also use a sub-box fabric to cover the sides of the PVC pipe opening. 8 inch subwoofer box design Skar Audio ZVX-8, ported box plan, 3D model. Net internal volume 1.25 cubic feet, port area 14.45 square inches, tuning frequency 36 Hz. Subwoofer box calculator online QES-8208” Cast super small enclosure subwoofer. Technical specs and contents. 1 e/a 8” Subwoofer. Frequency response 10Hz-400Hz. Power handling: 400WRMS (800Watt Pk). Impedance 4 Ohm. Sensitivity: 82dB. Mounting depth: 4.41” Cutout diameter:7.25”. Cast frame: OD 8.25”. Get help for the Sealed vs. Ported Calculator. Use the Speaker Box Designer to Determine the correct Speaker Box Volume for Your Driver. Determine if you should use a Sealed or Ported Speaker Box for your Driver. The same guy saying he did better with a smaller box may do better with a bigger box in a different car. Or the same guy doing better with a big box with one sub may do better with a smaller box with another sub. And vice versa. The manufacturer recommended enclosure is a good starting point. Build that. Measurements for 8-Inch Type-R Subwoofer. If you are building a sealed box for the 8-inch Type-R subwoofer, the recommended external dimensions are 13 inches by 13 inches by 5.5 inches. This will give the box a recommended internal volume of 0.30 cubic feet. The ported box's recommended external dimensions are 11 inches by 8.5 inches by 20 inches. .

subwoofer box volume requirements