BoxPlot will accept either values and I think if you switch between systems, it converts all the fields automatically. As for hauling these, I think you should look into a trailer unless an Audi 80 is a station wagon. :^) Parts Express has a speaker selector wizard on their web site. You enter your usage, size, box size, etc, and it gives you a list of speakers that are close. At least it narrows the list down. To keep the size down, consider some 12" drivers. Chris