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I'm doing some work on a 12-string acoustic guitar, and am planning to replace the nut and saddle. I need to raise the action a little bit for the E and B strings, and also want to change to a slightly heavier gauge, so I'll need a nut with slightly wider slots; the low E string doesn't quite fit in the slot as it is, and heavier strings will make this problem worse.

How much does nut and saddle selection affect tone? I like the tone of the GraphTech ones I have -- it's definitely better than the plastic nut and saddle that came with the guitar. But are there options for anything better?

enter image description here

The self-lubricating factor of Tusq material is very subtle, and though the tone is good, am I better off looking at a bone nut and saddle? Are there issues particular to 12-strings? (The tone on this guitar is quite good, although a little muddy.)

The guitar's pickup is a soundhole-mounted Fishman, so there's no undersaddle pickup to interfere with the acoustic sound.

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I don't know that the specifics of the 12-string make a real difference to this question. The tone difference should be the same with 6 or 12 strings. Maybe the question should be changed? –  VarLogRant Mar 13 '11 at 4:01
    
@VariLogRant - If I'm wrong about this, someone please correct me, but 12-strings do tend to be lacking in bottom-end tone, due to over half of their strings being unwound (I think) so transmission of low frequencies to the top is even more important than on a 6-string. (If I knew what wood this guitar is made of, then that would be even more relevant information.) –  neilfein Mar 13 '11 at 6:27
    
If that is a picture of the guitar above, I'd say you have a solid spruce top. And urah, maybe there are some problems unique to 12-strings, I'm sure there are many who have the same questions about how nut and saddle material affect the tone of their 6-string guitars. –  VarLogRant Mar 13 '11 at 15:54
    
The reason your twelve string sounds more tinny is due to the lack of lower voiced strings. Check out my updated answer. –  Jduv Mar 13 '11 at 16:15
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1 Answer

up vote 8 down vote accepted

The nut and saddle simply act as conduits for the vibration of the strings to the body of the guitar--so their effect on the tone of the instrument is pretty small. Other people may tell you different though ;). An acoustic guitar lives and dies by the geometry of the instrument--and the majority of the sound is projected from the sound hold and the top as the body of the guitar acts as a natural amplifier. A better nut and saddle, if anything, will get you much better tuning stability and maybe a little better transfer of vibration from the strings to the top through the bridge and saddle; that could net you a little better sustain from sympathetic vibrations.

To give you some context, all of my electric guitars are equipped with bone nuts--which really cleaned up all my tuning stability issues and squeezed a tiny bit more sustain out of my Les Paul. I couldn't really notice a huge difference in tone based on the upgrades--which was from the cheap-o stock plastic nuts.

It also sounds like you are struggling with the lack of bass on your 12-string. Going to a lower gauge string set is a really good step in this direction, but a 12-string guitar is going to naturally sound brighter than a standard 6-string acoustic. Why? Well take a look at these two graphs:

12-string string values 6-string string values

Forgive me for getting all nerdy on you :D. Basically what you should take away from this graph is there are roughly 3 times the number of smaller gauge strings on a 12-string than on a standard acoustic assuming the cutoff is below the low D (0.036). The ratio is 3:9 for those of you math aware. So, from this you can see that the smaller, higher voiced strings have nearly thrice the presence--which will get you three times the highs. Note that I did these calculations using a medium set of Elixer Acoustic Phosphor Bronze and a medium set of Martin 12-String Phosphor bronze.

So there you have it :D.

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The guitar does have problems staying in tune, so I'll price out bone nuts and saddles. I think that the tone problems are here to stay, although they're fairly minimal. –  neilfein Mar 13 '11 at 6:30
    
Also, I'd heard that a guitar's sound comes chiefly through the vibration of the top, and not through the soundhole. However, thinner-bodied guitars are definitely softer and more tinny-sounding, so I'm not certain that's true. –  neilfein Mar 13 '11 at 6:32
    
The top certainly provides a very large proportion of the tone of the guitar, I'd say 80% - 90% if I had to assign it a number. Note that I only said that the majority of the sound is projected from the sound hole, I didn't say it generated the tone of the instrument :D. The geometric configuration of the instrument allows the top to vibrate freely--along with the strings and other pieces of the instrument, thus generating your tone. –  Jduv Mar 13 '11 at 13:37
    
+1 for seeing a graph on a guitarforum! Very Rock and roll...(= –  mrbuxley Mar 13 '11 at 16:35
    
Nice edit! I'd upvote again if I could. :) –  neilfein Mar 13 '11 at 19:29
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