Hi all, this is urgent cause I don't have much time to return it if bad ... I just got a used Clarus 300ia head and need to know if its in working order or not ... I get speaker sound clicks whenever I plug into the amp head ... this is despite ALL the knobs turned all the way down (including on the p-bass itself)... It also clicks when turning the clarus off. Is this normal for the clarus to do this ? I don't want to hurt the new speaker I just got (EA 110). Thanks a ton in advance, John.