Well, @SkipdiverJohn , I play a Fender Precision Bass. This is the most basic of electric instruments, a couple of coils. eight magnets, some wire and two variable resistances, all coupled to a jack socket. The rest of the magic goes on elsewhere, ie amp and speakers. As you will read, and know from the cycling world, people like to dream up solutions to which there are no problems...And an active bass is one with batteries and electronics on board. Passive has worked well since 1951 (1920s if thinking about 6-string guitars), and I profess myself a Luddite when dealing with 'active' instruments!