Hi guys, First off all Iwant to say that Im from holland, so my mothertongue is dutch, so excuse me if I make mistakes. I visit some dutch forums,but on this one I see, that most off you guys have knowledge about basscab design, so I want to ask you if you want to help me with that. Im a 4 string bassplayer,and build two or three cabs in a couple of years,but sinds the last twoyears I dicover winisd. I build a cab with the kappa15, without studyng winisd properly,so the result was bad. I ditn concider the things like powerdip,cone excurtion and group delay. From my experience till now, I want to go for the kappa15lf because of the reasonable powerdip which is around 200watt. My problem is,Idont know where to start. For example, do I have to tune the box at 40hz, and then see if the -3db is near 40hz? Im looking for power from 40hz till up. If you have time, can you help me with this? Greets qts.