i just bought a wt500 on the bbay and it is freaking noisy from thhe moment i turn it on. i A/Bed it next to my GK 400RB and the hiss that it makes when its just sitting there is about twice as loud. also whats weird is the eden is rated at 600 watts bridged and the gk is rated at about half that (cant remember) but the Gk is way louder when im playing my bass compared to the eden. with the eden the only way i can get significant volume is when the gain is turned up, otherwise im running the eden with the volume turned to the maximum level. any thoughts before i take it in and get taken by the seat of my pants? i have a recording coming up and the eden hiss is too loud to be recording with. also, the eden was made in 1976 if that makes any difference.