having built 5 electric guitars now I thought I'd have a go at making a bass. The thing is, I know a fair bit about guitars, I don't know much about basses. I like modern bass sounds so I was thinking of trying to get some active pickups, but I'm a bit lost with knowing what one needs. With active pickups does one also need to be getting some sort of preamp?  Could you get passive pickups and add an active preamp?