Ok, I know there are all sorts of jazz pups out there, some are really stacked humbuckers disguised to look like jazz pickups. And I know that any single coil pickup will hum when soloed. What I want to know is: Is a standard Fender Jazz bass wired so that the two Jazz pickups are humbucking when used together? ie: Is both the magnetic polarity and electrical polarity reversed for the neck and bridge pickup in a traditional jazz bass? Thanks!