I have a Mesa 8x10 and am in very loud band. I use distortion and fuzz occasionally. Long story short, I periodically blow speakers. I mean really blow speakers. Check the picture. This last time out I had a few blown before I realized it, and I ordered replacements from Mesa. I've replaced them before and everything has been fine. The thing is this time, the top two speakers in the 8x10 are behaving as if they are out of phase, even when I flip the wires to the terminals. I marked the wires, installed the speakers, and did the battery test. The top two barely move at all while the other six pop right out. Flip the wires, same thing happens. The speakers are new from Mesa, but I suppose one could be bad, and being in series, both aren't firing? Obviously, the cabinet sounds weird and quiet. I took off the back panel, but the player control network is too complicated for me to decipher, and nothing there has been changed. I'm going to call Mesa tomorrow, but I figured I would ask the cabinet gurus here also. Any thoughts?