I have not listened to my 4345’s in quite a while. I bought some new electronics ( NAD 375BEE NAD CD PLAYER) and wanted to use them again. I noticed the speakers sounded bad. Both 2405’s were not working. I tried turning the potentiometers back and forth many times, but that did not work. What next? I will check the tweeters outside the crossovers first. If it is a crossover issue, would now be a good time to upgrade some parts? I’m not a technical expert. Any advice would be appreciated.