4- new VFL8's behind the seat of my standard cab Dodge on a Sundown SFB3K. The box is 4.1 cubes net tuned to 33 hz. and peaks at 29 hz. in the truck. Big 3, AGM, and a Mechman 320. It's also got 4- 6-½" coaxial and two 3-½" super tweeters in factory locations on a 400 watt American Bass 4 channel amp. My recent daily driver build.