I missed that... you are getting overheating faults? That is definitely a bad sign.\n\nAs mentioned above, the Polk Speakers are not friendly electrical loads. You could be well on the way to blowing out your AVR.\n\nDo you employ an active cooling solution on your AVR? Something like the AC Infinity Aircom units:\nhttps:\/\/www.acinfinity.com\/component-cooling\/component-fan-systems\/aircom-t8-receiver-and-av-component-cooling-blower-system-rear-exhaust-17\/\nOr more simply just some 120mm fans:\nhttps:\/\/www.acinfinity.com\/component-cooling\/component-usb-fans\/multifan-s2-quiet-usb-cooling-blower-120mm\/\nhttps:\/\/www.acinfinity.com\/component-cooling\/component-usb-fans\/multifan-s7-quiet-usb-cooling-fan-dual-120mm\/\n(Just examples, but I use an Aircom similar to the first link and it is great!)\n\nAnyway, the other aspect of this is that you may well be overdriving the AVR with multiple Polk Speakers. Getting good amplification that can handle the current loads posed by those speakers is important. Bi-Amping will not help that, though, just to be clear.\nThe electrical load of those speakers will generate a significant amount of heat in the Amp Stage which then must be dissipated. Heat is the number one killer of electronics.\n\n\nI have some USB fan I have hooked up to the USB port. Initially I had it on the side of the enclosure, now I just put it on top. I didn’t want to put it right on top initially because air movement can cause issues with electronics (specifically my cable modem). Doesn’t seem to have affected anything.\n\n@Fried Chicken would you be willing to take photos of the insides of the speakers? We would need to see the Tweeters. What is meant by squished? We would also need to see the XO. Knowing the model of the Tweet would be nice, too, as we can look and see it's performance criteria and thus cross reference perhaps to the actual XO transition to the High-Woofer. Seeing the XO itself might tell us if it was modded in addition to the Tweeter replacement.\n\nI’ll see what I can do. The speakers are Paradigm Monitor 9 v4. Like I said I plan on selling them, although I do quite like the sound they produce (except the soundstage is moved to the right).