Ok so here is the deal. I have a set of four Rca pro-lx550 bookshelfs and the matching pro center and all are 2months old. These are the infamous Linaeum tweeter design from Rca. I have yet to here a tweeter like these. Awesome. I am asking $200 + split shipping for the set.I thought someone looking for these might have a good home for a set. It is impossible to find these except on the rare E-bay auction. Ask any questions or pm me. I know guys its not Polk stuff but these are rare and I know you guys have seen and probably heard these before. Just trying to give someone a good deal.