I own a pair of Infinity RS-5 tower speakers. Before I purchased them, I looked into the RS-4's which had the same type of drivers, only instead of a tweeter sandwiched between two midrange drivers, it had one tweeter mounted above one midrange. Now conventional wisdom leads me to believe that paying $200.00 more per pair just to have an extra midrange driver identical to the other is somewhat of a waste. I want to know if infinity changed the crossover frequency and what the advantage of this design is.