Apologies for the numpty question... I have a Rumbler FS Ubass, bought 4-5 years ago and I have a question about the installed pickup, a shadow with built-in tuner & EQ. Is it likely to be a passive or active pickup? The fact that it's powered means I thought it was active, but it's that just for the tuner? However, I think it's a piezoelectric pickup, so passive, right? I'm asking in order to understand whether I should be using a pre-amp or not. So an answer to that and choice of DI box would be a bonus! Many thanks for your help.