QPower® Heavy Duty Series 15" 2-Hole Forward-Firing Ported Subwoofer Box (QHD115V) 0. $63.67. QPower® Heavy Duty Series 15" 2-Hole Forward-Firing Ported Subwoofer Box with Square Hole (HD215 VENT SQ) 0. $115.33. QPower® QBomb Series 12" 2-Hole Upward-Firing Sealed Subwoofer Enclosure (QBDODGE12 4DR) 0. $143.03. Step 1: The first step involves the removal of the subwoofer from the enclosure. Take a screwdriver and start removing the screws from the enclosure (screw holes). Follow the process until the driver is completely detached. Step 2: The measuring process starts by keeping the subwoofer with the cone facing upwards. December 23, 2022 by Skystream Energy. Calculating the dimensions of a sub box involves several steps. First, determine the depth, width, and height of the sub box. Depth and width should be based on the subwoofer’s mounting depth and outer diameter. This information can be found on the side of the subwoofer box or in the subwoofer’s user The Skar Audio ZVX-12v2 D1 12-inch dual 1-ohm subwoofer is an ultimate powerhouse driver, unrivaled in performance and reliability. The ZVX-12v2 offers the perfect combination of size and power, conservatively boasting a 3,000 watt max power rating. This 12-inch SPL subwoofer was engineered to withstand brutal everyday use while performing Enclosure Volume (V) = (Qts * Vas) / (Qtc^2) Where: V is the enclosure volume in cubic feet or liters. Qts is the total speaker Q factor. Vas is the speaker’s equivalent air volume. Qtc is the desired total Q factor for the system (usually chosen for specific sound characteristics). The goal is to match the Qts and Qtc values to ensure that 6.75" CompRT 2 Ohm Enclosure. The CompRT 6-3/4-inch Subwoofer Enclosure is the easiest way to get great bass under your seat, behind your back bench or in your cargo area. It comes loaded with a reFLEX™ passive subwoofer and CompRT active sub for extremely low bass, then carpeted and loaded with a single 2-Ohm terminal. Step #1. The first step of “How to make a subwoofer box” guide is making a sketch of your box to have a visual representation of how it should look. You have to paint where the hole will be made and, of course, write down all the dimensions. This will make your work a lot easier. Step 7: Placing the Subwoofer Enclosure. After everything is set, put the speaker wires from the terminal cup to the subwoofer. Put the subwoofer into the enclosure. Then place the enclosure in the truck space, secure it with mounting screws. Truck subwoofer enclosures put out full, rich deep bass in your car’s audio. 8MHA.