Maybe someone else can add, but Vas is driver/suspension stiffness. Bigger Vas means bigger box. I think Vas has mostly to do with getting the proper size box and efficiency.

Clipping a 500 watt amp surprises me too. Is it hooked up right? That should be a LOT of bass for a HT.

Xmax is how far the driver can move before distortion becomes audible. That is because some part of the sub reaches a limit of control. It should be self explanatory as to why that is important. The BL (motor strength) vs x (position) curves look different too. Let's make sure the above stuff is understood and correct first though.

[This message has been edited by JT Clark (edited May 27, 2004).]

[This message has been edited by JT Clark (edited May 27, 2004).]