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My Takamine acoustic has a tendency to buzz when I play the high e string fretted around frets 2 and 3. I figure it's something to do with the neck and tension rod. Are there any other parts of a standard acoustic guitar that can be adjusted to fix string buzz? What's a safe procedure for adjusting the tension rod? Is there anything else that could be causing the buzzing?

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I lean toward your frets needing to be checked and maybe leveled and recrowned. If the saddle was too low you'd tend to hear the buzzing up and down the neck. The nut can't affect a fretted note because the finger pressing down negates the nut's effect. It's also possible the neck is a bit warped or twisted but that's pretty rare in comparison to frets that aren't seated right or not leveled. –  Anonymous Jan 14 '11 at 9:19

3 Answers 3

Buzzing is almost always caused by a string vibrating against a fret. This could be due to a worn spot on the fret you are pressing on, which results in the string being lower at the point of fretting and higher, unworn frets being in the path of vibration. Finding out which fret is the culprit can be done with a straight edge, but I recommend that you take your guitar to a luthier for a look see. Those guys are professionally trained to spot issues like this, and nearly all consultations are free (at least with the one's I know).

Considering the truss rod, I wouldn't monkey with that. There's a lot of information on the web about how to adjust those, but there's a really good chance you could warp the neck if you don't know what you are doing.

Also, a mis-cut nut, action that is set too low, or playing with a heavy hand can cause these types of buzzing. If you are a hard strummer, consider dealing with the pain of higher action for less buzz. It's a trade off we all have to manage.

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A mis-cut nut won't cause buzzing on a fretted note, only open notes. The saddle could cause the problem on fretted notes though. –  Anonymous Jan 14 '11 at 9:13
    
Correct, thanks for clarifying that! –  Jduv Jan 14 '11 at 14:43
    
"Buzzing is always caused by a string vibrating against a fret." No. There can be loose parts inside, or, like I had, a string buzzing against the bridge. –  Anonymous Jan 17 '11 at 12:14
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Updated to reflect Bill's comment. Thanks! –  Jduv Jan 17 '11 at 17:23
    
+1, twice over! :-) –  Anonymous Jan 18 '11 at 0:27

Could be caused by a high or low fret.

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I had exactly this problem a while back, which I suspect was caused by the nut bedding down a bit. I sort of fixed it by changing my string gauge so I now have slightly heavier at the bottom end (56 instead of 53 if I remember rightly). The higher tension has pulled the neck up just enough to clear the buzz.

I should say that I did this to get more bass out of my acoustic (it's a narrow body) rather than to fix the buzz, but it sorted both.

Obviously, this is not a proper fix but an interesting little anecdote. (Maybe?)

Jduv is right, go and see a luthier or experienced guitar tech. Don't go fiddling with the truss rod!

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