Hi guys. I noticed something kind of funny. I get a crackle sound when I hit certain notes in the lower register. It doesn't drowned out the note or anything, but i can hear it. I also noticed the the Ampeg B25 cab. (It's a 215) Vibrates the heck out of my Ampeg SVT400T amp. So I took a towel and folded it up, set it imbetween the amp and cab... wala! No more crackle! I am going to take my amp in to the shop anyways, to check on it's loud pop, and also to check it's solder connections. Damn, that B25 shakes!!