I'm going passive with my single MM pickup'd bass. I first had it wired just pickup straight to jack and it sounded great, but i miss having a volume control. So i'm trying to wiring it just volume (Ernie ball 250K) to jack. First i tried this http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=musicman_passive and it was just hi mids and treble, no low mids/bass at all! I just came back from wiring it like this http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=1hum_1vol but i changed the soldered off red+white to black+white to have it wired in parallel instead of series which i would get having red+white together. It sounds ok now, but the output is lower then when it was wired straight to the jack. It sounds "duller", less modern highs (which i want back!) and more aggressive mids (don't want), it sounds like when i had it wired in series a while ago. The Nordstrand wiring schematic for parallel says: Red + black = hot White + green + shield = ground. and for series: Black = hot red + white = solder and tape off Green + shield = ground What have i done wrong, or is there something wrong? Is this what i get when using 250K pots? Is the wiring wrong? Should i buy a better pot like a CTS? Or one with higher K like 500K to get the highs back?