I am looking to upgrade pickups in one of my basses and had some recommendations for Curtis Novak pickups. I e-mailed him and he suggested his PB-90 might be what I'm looking for. I've seen a lot of generally positive comments about his work, but does anyone have any experience with the PB-90s? Maybe even a sound clip? Also, if I get these would it be a good idea to install 500k pots?