Here's a supplement to OP's post about the ASB2-5 from the Seymour Duncan page:
Active "soapbar" pickup for 5-string bass.
Similar to Phase I, but with slightly harder attack and a modern, hi-fi tone with a smooth and broad response.
Unique split-blade design delivers the punch of a single coil, without hum.
Very pleasing, articulate mid-range with no harshness.
Includes logo covers.
Direct replacement for EMG® 40 or 45.
Often used together with STC-2 or -3 Tone Circuits for optimal tonal control.
Battery life is approximately 1,000 continuous hours per set.
Includes mounting and wiring hardware.