Truss Rod or Saddle Height

[Thunderpaws]

My P gives fret buzz on the last fret only when playing the second last fret. No buzz anywhere else. 

Action is low as I like it that way and the rest of the neck plays a treat. 

When adjusting the bass to rid it of said buzz, would I adjust the truss rod or adjust saddle height a tad? Is there a rule over when to adjust truss rod or saddle height and which order to do it in? 

Cheers, TP

 

 

[ped]

Check this out

http://www.garywillis.com/pages/bass/bassmanual/setupmanual.html

In short, the truss rod adjusts the relief which is how much bow is in the neck. Action is the height if the strings set at the bridge. Both do different things and can produce different results. A rattle on a single note however may be because a fret needs levelling. One way to check if frets are level is to use a credit card to see if it rocks on a high fret. 

 

Edit to add - if it plays perfectly everywhere else, and by last fret you mean up near the body, I’d leave it. 

[gary mac]

If I've understood your description properly, then it sounds as though the second from last fret is slightly high. If that's the case then it would need, either tapping back into position, assuming that it has lifted, or filing level and then crowning.