Sapphire is tweeter's house brand but that does not mean they are bad speakers. They are more efficient than the Polk's, but I think they have a tendency to sound a little harsh; they wear my ears out after listening for awhile. I have always prefered a warmer sound to the super crisp souind of Klipsch or Boston Accoustics, but it does boil down to preference. I would not say that Polk is better than Sapphire or vice versa, I just prefer the sound of Polk over the Sapphires.