The pickups most definitely do not need voltage, however the preamp does - that's why the 9V connector is attached to one of the circuit boards in the picture that Keavin posted.
You need a preamp because the Alembic pickups are low impedance, which is a mismatch for any instrument cable (which will be high impedance).
You'd need to check if the preamp is designed to handle low impedance pickups.