| It is hard to diagnose without seeing it, but depending on the bass, it's age and condition, I would check and do all of the following:
1 - check the fingerboard itself to ensure it is level. Check for humps, bows, etc. There are special straight edges that have gaps cut in them to clear the frets so you can check the fingerboard surface and not the fret surface. Old fender bolt on necks are kinda notorious for developing humps or rises at then end of the fingerboard, etc. If the fingerboard is off you will have to remove the frets and plane and sand the fingerboard down to level again.
2- after the fingerboard is level, install new frets and dress them. If the fingerboard was level, then all you need to do is shave/level down the frets and redress. A good trick for lower action is to dress them down with a "fall away" from about the 14th fret or so, that is, each fret from the 14th on up is slightly lower than the one before it, kind of a very, very slight ramp effect. Some luthiers will even put slightly smaller frets in above the 12th fret or so for this effect as well as better intonation with a smaller fret.
3 - check the nut grooves for proper depth. This is done by fretting each string at the 3rd fret and then checking the gap between the string and the 1st fret. You want a VERY small gap here, but a gap none the less.
4 - adjust truss rod for either dead straight, or just a very slight amount of relief from about the 7th or 8th fret up to the nut.
5 - adjust intonation and string height to taste. You can set the string height just on the edge of where the string starts to barely buzz. This will be audible when played acoustically, but if adjusted properly will not come through your amp.
You might take it to a guitar tech and explain what you're looking for and get an estimate and doing the work for you.
:^)~
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Regards,
-Grandon-
"The Bass Kahuna"
www.gwbasses.com
www.basskahuna.com
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