PowerBass PS-WB101 10 Vented Loaded Enclosure Bass is their backbone at PowerBass and their engineers have designed an affordable, yet powerful self contained solution to put a new low in the bottom end of your sound system with PS-WB loaded woofer boxes. They take a unique design approach and engineer the woofers to fit the box, not the other way around like our competition. This gives our enclosures a deeper, tighter bass that handles more power for your hard earned cash.