How much bass do you like? What subwoofer is enough or to much for you? what isnt enough etc. What is to little for you, what is overwhelming. It fascinates to see the broad range of bass fanatics. Some think HSU's cheapest subwoofer is more then enough for them, overwhelming even. Then you got the multiple B4+ people. I want to know if what you got is for hobby (collecting bass) or for necessity. My Example: I have a PB2+ and im very satisfied with the performance where i dont feel the need to upgrade, but i do push it pretty dang hard. Its 18-20ft away. But of course there's the urge for more output below 15hz as rare as it is.