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Im having issues with alot of noise coming though my cabinets. I run through a gk 15 and a harke 4x10. When I switch it on i start getting a low rumble that builds to what almost sounds like thunder. Ive checked cables, changed basses. its not the cabs, i have another amp and i dont get any of the sound when i plug it in. ive had the head apart and cleaned it, still have the problem. some feedback would be greatly appreciated.