I'm a Hip Hop celebrity Jeweler out of Vegas. We have a full size promo van with 4 Boss 4000 Amps pushing 8 of these babies. Since this van was built specifically for sound to promote our company, we built 2 47 cubic Ft cabinets, & dropped 4 of these bad boys in each one. Over this Memorial Day Weekend, the van hit 182 DB of Bass at the Las Vegas Speedway. For the money,YOU CAN'T TOUCH THIS WOOFER! Spectattors say that the ground was bleechers were shaking in the stands.