I have Polk Audio Momo MMC6500 components installed in my QX4. The mid-woofers and tweeters were placed in the stock locations, and the xovers were placed under the Alpine HU in the dash. I am using a Kicker KX700.5 to push 1 JL Audio 12w3v2 d4, MMC6500 Components, and a set of DB675 also by Polk. Everything was installed by a local shop with a good reputation. So, I hope/trust that everything was done correctly. After several days of reasonably hard listening I began to notice a fluctuation in the treble produced from the tweeters at the same points on the same songs, then the tweeters got really loud briefly (about a minute), followed by nothingness. The tweeters no longer produce any sound; however, I noted that everything else still plays fine. At the time of the loss of treble I observed a distinct odor from what I would think was a burnt electronic circuit board. I have never used silk dome tweeters so I have no idea what they do or how they smell when they blow. The smell still lingers in the truck actually. My question is does this sound like I burned out my crossovers if that is possible (maybe unlikely because my mid-woofers still play fine unless the highs section was destroyed), or does it sound like I blew my tweeters. Or did I do both. I already ordered replacements but I wanted to know if there was anything I should check before I take the truck back to the installers with the new set that arrives on Thursday.