I have a SX jazz bass with Dimarzio Model J's, 500k pots as my backup bass. My main bass is an Epi Tbird. I AB'd the two basses and my jazz was about half the volume of the tbird. What could I do to fix this? The Tbird just sounds huge, the dimarzio's are supposed to sound big as well. If I could only find a set of Epi Tbird pickups ...
Generally when you AB something or want to use them both at a show, you dont want to have to worry about adjusting the amp or pedals. That defeats the purpose.
I had a similar issue which I solved. I recommend the following solutions: 1) a boost pedal and an ab switch (I use a Boss GE7B to adjust the volume and eq my passive bass). I built a passive AB switch but several companies make these. 2) Radial Bassbone. Very nice but I wanted more eq control and have a Jensen xformer DI so I didn't need it. Expensive but quality stuff. 3) EBS Microbass II - never tried it, very expensive 4) ab switch in front of a multi effect pedal where you hit a patch that changes volumes. 5) put a preamp in the low volume bass good luck
Changing the pickups for ones that are hotter will change the tone. Use a grease pencil and mark the settings for the two basses on the amp. Will take 2 secs and you're already changing instruments which will take longer than that.
I'm not too worried about changing a jazz bass' tone to something else. I'd love to see what a set of tbird pickups sound like in a jazz bass.