The funny thing is.... according to Sterling and Music Man say that the pickup itself is "passive" and that the only "active" part of the circuit is the cut/boost tone controls.
That said... our bass player can be very inconsistent with his input/output and I'm constantly having to tweak his channel on the board.... so this year I added a direct box directly after his bass and sent the pass through to the input of the amp. His tone shaping on the amp changes what comes out of his cab behind him, but I just take his clean direct bass and play that through the PA because it's cleaner and punches better.