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Hi guys, as I am trying to complete the long project of finding the perfect sound system I have come across some issues. I currently have focal isu 690 component speakers in the front of my car hooked up to an alpine pdx 4.100 4 channel amp. One day I hopped in my car and when turning up my speakers I was getting this distortion/crackly/possibly blown sound from tweeters. To this day I cannot tell what its issue is. It seems to happen when I turn my radio up (not at max) and despite the levels that my amp is at will sometimes produce this issue. The reason I have a feeling it is not blown is it only acts up on certain songs, almost like a certain frequency squeezes past the inline cross overs produced. It isn't the speaker wire itself as I have checked it many times, but I am hoping it is an issue with how the amp is set up. Since it has inline crossovers I have both woofers and tweeters connected to the 4 channel amp to my kenwood ddx24bt headunit that has front and rear R/L pre-outs. I am gonna post a photo of what the setting options are for input/output as that part could be the issue and has always confused me. I wouldn't need to turn on the high pass or low pass filter because of the inline crossovers correct. I am looking to take every component out and rewire it here soon. What is everyones thoughts or reccommendations, is there a way to tell if its blown, is it how I have it set up, what would be the best set up? Thanks guys!