I own a soundgear 4 string with an active circuit and I find that every bass I've played with an active circuit lacks clarity on the lows and sounds like a tin can when I play with a pick! I never had this problem with my J-Bass. I don't know what to do. I was thinking about getting my MIM Jazz back or could this problem be due to the fact that I'm playing through a MArshall guitar amp?
What basses have you played with active electronics? I have a Pedulla Rapture, a Zon Sonus Custom and a Peavey Cirrus, and they all sound richer and fuller than my passive basses. I also have an Ibanez SR506 and an Electra Westone fretless with preamps, and my passive basses sound better than they do. Also, you are using a Marshall guitar head, are you using guitar cabinets too? Bass doesn't sound that great through guitar cabs, they don't have the bottom that you need for a good bass tone.
It might very well be that you're using a Marshall guitar amp. IMO there's nothing that makes active or passive electronics sound inherently better--some preamps just sound bad, while some passive systems are just magic. In my experience, as a general rule, I prefer to use passive for recording and actives for live. My passive basses (Noel Redding Jazz, Mike Lull Jazz, Modulus Genesis VJ) seem a little warmer than my actives, and are a little easier to work with just because they have a more squashed frequency response. For live playing, I appreciate the tonal versatility from the onboard preamp. So again, as embellisher has already said, each active or passive bass must be evaluated on a case-by-case basis. I would take care of the amp first, though. fc
IMHO active electronics boost volume too, Along with that they just give you more control over your tone.