Jazz Bass SJB-1 / Volume issue

[Levin_Wannabe]

Hey folks, stumped here. SJB-1 set. When the bridge pickup is all the way up, no issue. When the neck pick up is all the way up, no issue. When they are both all the way up, there is a 1/3 drop in volume. Any thoughts? Attaching a photo of the pots / control panel. Thanks.

[treyhaislip]

Re: Jazz Bass SJB-1 / Volume issue

That's a first for me. Here is a thread about it from another site. Hope you can get it fixed (hopefully others will chime in.)

https://www.talkbass.com/threads/volume-drop-from-turning-both-pickups-all-the-way-up-on-jazz-bass-why.975657/

[Mincer]

Re: Jazz Bass SJB-1 / Volume issue

Is one of them reverse wound? Perhaps out of phase? Or the weird connector isn't labeled quite right?

[Kamanda~SD]

Re: Jazz Bass SJB-1 / Volume issue

That's pretty normal on a bass. Insertion loss or something like that its called. Usually more apparent with mismatched pickups

[Mincer]

Re: Jazz Bass SJB-1 / Volume issue

It happens a bit on my J bass, but it doesn't drop in volume by 1/3rd. More like 1/8th.