I get weird crackling noises on my 15W crate amp (hey, that's all I need for now

) when I play my dean edge 5 fretless. It has active electronics. I change cords, same deal. I plug in my passive SX bass and it's all good. Any ideas on what could be wrong? Bad wiring? Bad cables (I tried two, one of which I hadn't used almost at all)? Too close to the amp? (I sit like a foot away from it, and it's elevated to be on my level) Bad pickups?