I had two sets of MB quart refence series 4" components, the one that mount coaxially, and I noticed that the left channel sounded like sh*t. (I have them running off a phoenix gold ti400, with 100 watts rms per side, 50 watts per speaker). I tested the amp outputs with a spare speaker and it sounded fine so I swapped the left and right connections an sure enough both speakers had thier woofers blown (no sound at all) I intended to put the good speakers into my rear doors so I could at least have stereo sound until I replaced the front speaker wit hsomething a little bigger and low and behold, the left rear woofer is blown too. I know I can't have the one remaining speaker playing by itself, because 100 watts will probobly blow that one too. What the hell is going on here. everything was professionally installed, but I don't think that this is normal. what should I do?