Well that "signature" sound comes from a solid maple body and neck, the HAZLab 9v preamp and a NT maple neck.. that is the real signature sound.. beyond that, the others come close.. i don't care for the DC35 style pups.. the real sound comes from EMG active P/j set up.. and if you notice, the jazz pup is actually the neck pup.. not the bridge pup. But, Rebops and get that growl that Spector is famous for, a lot come with the TonePump pre.. which is a step up from the TonePump Jr. that comes in most Legend basses.. There is a fan base for the TonePump pre.. it is strong, it is loud, meaning it is a very hot signal to the amp.. if you get the TonePump with the Trim Pot, that will most likely work better.. the pre i like is the Tone Capsule with passive pups.. if it is active pups.. then the HAZ 9v.. which is the Spector heart and soul to the basses!