Hi I just got a used GK 800RM amp with a hartke 4x10 XL cabinet and a hartke 1x15 cabinet. I have notcied from the 4 10's that there is a lot more noise coming from them. is this normal? I'm trying to figure out if there might be a problem with the amp or the cabinet itself. I've tried different cables same thing. I also tried plugging the 1x15 into the high jack on my amp and the hiss was not as bad when I plugged the 4x10 cabinet into the low jack the same amount of hiss came from the 4x10's So I'm not sure if this kind of hiss is normal or something is wrong with the cabinet.