I have a cab with 2 V30's and 2 G12T75's in an X pattern, and when I mic up just a V30...it sounds different than any other cab I've had with all V30's. I realize each cab is going to sound a bit different, but I'm noticing a greater difference in the cab with the G12T75's, even though I'm close mic'ing just a V30. Has anyone else noticed this?