I did play with various settings but this one seemed to model very much like a 15Hz second order HPF which puts excursion @ max power slightly above Xmax in my system. I am not sure if this is conservative enough but that's the gamble I took. Generally I think if a second order HPF provides adequate protection in a given system, then using this workaround should work just as well. almost.
Edited by zheka - 3/13/13 at 6:02pm