I looking at (maybe) getting a Warmoth Gecko 5-string bass body. The suggested pickups on Warmoths web site are Seymour Duncan ABS-5. Are these pickups active? The bass they show has the SD pups but no onboard preamp. Is that correct? If so that would be ideal for me because I rarely use the preamp on my bass but I do want the clarity of an active system. How do these things sound?