Conclusion: I installed this subwoofer in a ported box in my Honda Accord. Its powered just right by a RF Prime r250-1 amp. This sub is excellent. It adds an excellent lower end to all my everyday music. The sound quality is incredible. It resonates very well in my car. Also, if I want to turn it up and make some street noise, I have the gain remote that came with the amp, and it can slam if you need it to. It drops the jaw of whoever hears it at loud volume.