Joris, BGavin, et. al. - I've been playing around with WinISD for a while now. My first question is can you find out how much power/volume it will take to get to the mechanical limit of the driver? (Xmax) The power graph seems to take into account only the thermal limit of the driver, that is the rated wattage of the driver. Second question: how much group delay is acceptable? I know that's kind of vague, but is there a rule of thumb to use? Have I stopped making sense?