SVS 4000 Series subwoofers unleash reference quality bass at a breakthrough value. With trickle down technology from the 16-Ultra Series, named top subwoofers in the world by nearly every audio publication and industry group, the SB-4000, PB-4000 and PC-4000 subwoofers demolish expectations and deliver a level of subwoofer performance that's unmistakably SVS. Learn about the technology behind these high performance subwoofers in this video. | SVS