I really want to buy these for my main L & R for cinema use and stereo. In the best buy review it says the tweeters are easily damaged. How does this damage occur is it by simply playing too loud or by the type of music Hard Rock etc.. What would be the first signs of any damage and if so can it be repaired. I'd be gutted if they broke 7 days after purchase. I want these as a step up from my Wharfedale 9.1's. My maximum listening volume never seems to go above -20dB. Is this a safe limit for these speakers. I look forward to reading comments/info.