i just bought a used eden 410xlt cabinet...700w, 8ohms, powering it with a qsc 2450. i am getting very good tone and good volume. i'm using a 5 string with low b and the problem occurs when i hit those low notes. i don't think it is the speakers themselves rattling or distorting because if i put pressure with my hand on the back of the cab by the input jacks it goes away. it's like there is something loose in the back. i haven't opened anything up yet but it seems very solidly built. anyone experience this type of problem? any help is appreciated. thank you. by the way i tried to call eden and was on hold for 45 min before i hang up, and i emailed them a week ago with no response...not much in the tech support dept.