Seymour Duncan bass upgrade

[pougema]

Need help, I've just upgraded a Bass Collection p bass, added a Seymour Duncan SPB 3 and a SJB 3 Quarter pound, 3 cts pots and and .47 cap, shielded all the cavities, when i turn on the p bass pickup, it sounds great, when i add the bridge one it cuts the volume a bit and tone on the G and D , any ideas

[Roger2611]

I wonder if it is a phase issue, I have a feeling Seymour Duncan uses opposite phase to standard on their pickups, I have a SD59 humbucker in the neck of my Les Paul and a Lindy Fralin in the bridge position, on the middle switch position (so both pickups working) I get exactly the same issue you describe....I know that is down to phase differences between the two pickups....if I back one of the volumes off a fraction it totally transforms the sound to when both are on full volume.

The fact that you are using two SD pickups should negate the issue but wiring can do very strange things!

[ezbass]

1 hour ago, Roger2611 said:

I wonder if it is a phase issue, I have a feeling Seymour Duncan uses opposite phase to standard on their pickups,

This rings a bell with me.

[pougema]

Got it sorted, rewired front pickup, the link wire and the ground so it was a  phase problem, thanks guys, keep safe