Generally, I've seen that active basses tend to have noiseless pickups. I'm generally talking about J pickups here. Fender, for example, offers a variety of noiseless pickups on their active basses, from the "noiseless" to the "samarium cobalt noiseless" to the old single pole per string Suhr ones. However generally all of their passive basses have traditional single coils, with hum if one pickup is soloed. Similarly, most active Fenders do not have single coils, and few passive Fenders have noiseless pickups. Is there a reason for this? I'm wondering if this has something to do with impedance and seems to suit a particular impedance best. Or maybe it's just because active basses sound different from passive basses, from the get-go, and so they might as well add the noiseless pickups since it doesn't matter that dual coils don't sound like single coils anymore. Or maybe it has to do with active pickups and passive pickups and all that stuff. Anyone care to take a stab at it?