This is the second time I have had this problem. I have an all Polk set up using RT55i's for my mains, surrounds,& rear surrounds, & a CS400i for my center. My receiver is a Sony DA 5ES. My speakers are set to small & all crossover points are at 100hz for them. So heres the problem the tweeters are getting so hot within a matter of minutes that is is causing them to melt near the voice coil, or more specific the edge of the dome is melting where it joins the coil. I had this happen to my center when I first got them & I had thought it was just defective because this happened at moderate volume. But know I just noticed that my center & both mains are starting to do it again. Now I realize the first thing most people are going to respond to is ( turn down the volume ) but it is doing this at pretty mild levels. I have noticed that the tweeters seam to be getting some upper mid bass to them as if you touch them wile you have some music playing they seam to get IMO alot of movement with bass notes. I have tried everything I can think of from setting the crossover points different to changing the EQ settings but it either just sounds like crap or I get no real change in how the react. So what I'm wondering is there something I can do like modifying the crossover to the tweeter to get less mid frequencies to it, or even if I had to go as far as putting a different style tweeter & crossover in the cabinets. I just wont something that is not going to melt every time I wont to listen to some music, but over all I like the way they sound so I don't wont to go extreme & totally screw up how they sound. I realize this is a touchy subject as there can be or are so many variables when getting into crossover points & speaker design so alot comes into play here. But if anyone can give me any ideas that might help to resolve this problem it would be greatly appreciated.