Hey, I was doing a frequency sweep from 130Hz to 225Hz and between 180Hz and 170Hz my right speaker started making a strange sound like it was breaking up or static. It was just in that range and was fine outside that range. I unplugged the right speaker and just did the sweep though the left with no problems and when I plugged the right back in it came back. Any ideas on what it could be? crossover? woofer?