I did feed the 7's too much power and as a result I have blown midrange driver. It's a 5 1/4" driver with Polk MW5534 (RD5534) on the label. I will most likely move these into surrounds and another pair of 7's for mains. I will not repeat the same mistake with these but now I will have to find something to replace the midrange drivers with. Search on internet or Polk website didn't yield any result for MW5534 or RD5534.