If you prefer a different form factor for the sub enclosures you have the chance to easily build your “personalized” version by yourself. If you want to use your trunk volume optimal due to a car specific shaped enclosure, your own creation is ideally. As with the Plug & Play-Subwoofers the single chassis are 100% identical to the drivers that are used in the pre-loaded variants. Therefore a simple rule takes effect in this case - as long as your customized cabinet conforms to our specifications with respect to the net volume and the matching of the bass reflex channel, identical sound performance is guaranteed. Give free rein to your handcraft skills and build the perfect subwoofer for your car.