Have been looking for my elderly Roadster for a solution that the chronic lack bass - especially with the top down - eliminated. With the installation of high-quality processed JBL Basspro II now this was as impressive as easily solved: The box completes the frequency spectrum down harmoniously and shaking the vehicle when it needs to be properly through. By integrating loudspeakers and amplifiers in a housing can also save space and running wires - almost plug and play. For the price an incredible amount of power and therefore an unrestricted Purchase Recommendation!