This picture shows the steps that go into making a custom fibreglass subwoofer box. In step one we&#x27;ve covered the area with masking tape, then 4-5 layers of fibreglass matting are applied and set with resin. The third step shows the back of the custom subwoofer box once it’s dried and removed. The fourth step shows the finished subwoofer box enclosed with carpeted fibreglass to match the Volkswagen Touareg’s interior.