I wanted to complete the sound system and have a very active and full sound. To get that, I needed an actual subwoofer. A JL 10" was the most I could fit in my trunk and this is more than enough. It is made to be quick released and goes over my rear strut bar. It sounds good with a ported box. This covers my low end and it is powered by a small hidden Memphis 300 watt amp. Easily taken out in a minute.