No, most subs use a digital coax cable with RCA connectors. (some very high end ones use balanced XLR cables) For short runs (under 10', IMO), any old RCA cables you have laying around are fine, if you don't want to pick up a digital coax cable, but they're not expensive especially at places like Monoprice.which is just your standard speaker wire, right?
Have you checked the Klipsch forum classifieds?I am on the hunt for some used La Scala's to use in a project that I am going to do. I want to find a used set of 3 La Scala's, for my L/C/R accross the front. I will be adding a K-402 horn to the top of each La Scala and will disable the mids and tweets in the La Scala's, as well as the crossovers. I will be running these "Active" as well. I am looking forward to this little project and will most definitely keep you guys updated. I probably won't start until mid August or so. In the mean time, if anyoine comes accross any used or "beater" La Scala's, then please pm me!