Hmm, well you can't really have a pickup that way, I don't think. At least, I've never seen an active/passive bass pickup. I've seen passive pups with active electronics, active pups with passive electronics, and so on. But I've never seen a single pickup that is switchable between active and passive.
Most EMG pickups are active, meaning each pickup has a small pre-amp built into the case of the pickup itself, which requires a battery to operate. (EMG uses low-impedance coils for sensitivity, but since those coils produce a weak signal, they build a small pre-amp to boost the output signal into the pickup casing itself, which is epoxied in place.) EMG HZ and select pups are passive, but the rest are active.
Aside from EMG pups, I would wager that the vast majority of "active" pickups are actually passive pickups connected active electronics. The pups themselves are passive, but the pre-amp is powered.
Last edited by HaMMerHeD : 09-21-2013 at 03:03 PM.