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How do you adjust the intonation on an acoustic guitar?

Author

Matthew Martinez

Updated on March 02, 2026

How do you adjust the intonation on an acoustic guitar?

Intonation has a relationship to the action (that is fact not opinion), the higher the action the further you have to bend a string to get it to fret. So if you raise the action without any other alteration you make a fretted note slightly sharper.

Subsequently, one may also ask, can you adjust intonation on an acoustic guitar?

No, usually the intonation on an acoustic guitar is fixed by the single bridge piece. If you take it to a guitar store, the luthier there could either file yours or replace it with one of proper dimensions. Don't try to file it yourself, as you could easily remove too much and ruin the entire bridge.

Also, why does my acoustic guitar sound bad? Assuming that the strings are not worn out, the two most common causes of a guitar with proper intonation developing problems with intonation would be: A change in the amount of "relief" or bow in the neck. The bridge beginning to come unglued or separating from the top.

Correspondingly, what affects acoustic guitar intonation?

In the end, intonation on a tempered scale instrument can never be perfect. And keep in mind that another factor that can affect acoustic guitar intonation is a person's playing technique. In other words, in a certain player's hands, even a properly set-up guitar can sound like it's out of tune.

How can I make my acoustic guitar louder?

How to Make an Acoustic Guitar Louder

  1. Tip #1: Play the guitar harder.
  2. Tip #2: Play with Audience in front of you.
  3. Tip #3: Play closer to the bridge.
  4. Tip #4: Get a clip-on microphone.
  5. Tip #5: Get a guitar that has a pickup and volume control.
  6. Tip #6: Choose to play in a small room.

What causes bad intonation?

Here are some common causes of poor intonation.
  • Faulty Guitar Strings.
  • Too High String Action.
  • Extreme Guitar Neck Relief.
  • Intonation Pieces Aren't Positioned Properly.
  • The Nut Is Worn Down or Not Set Properly.
  • The Frets Aren't Positioned Properly.
  • The Frets Sit Too Loosely in the Slots.
  • The Nut and Frets Are Worn or Damaged.

How do I know if my truss rod needs adjusting?

If you hear buzzing, or if the fret fails to sound a note, then your guitar neck has bowed upward toward the strings. This means that you need to loosen the truss rod. Grab yourself the appropriate Allen key and give it a turn to the left.

How high should the action be on an acoustic guitar?

A typical action on an acoustic guitar is at around 5/64″ (2.0mm) on the high E string and 7/64″ (2.8mm) on the low E string. The slight increase in action height gives an acoustic guitar's strings more room to vibrate.

Does action affect intonation?

Yes; changing the action will affect intonation -- how much depends on how much you alter it.

Can you adjust truss rod with strings on?

You can adjust the truss either way, with the strings tuned to pitch or downtuned. Just be sure to retune it to the correct pitch once you make the adjustment.

Does string height affect intonation?

Assuming a vertical saddle slot, changing action height does have some small effect on intonation. Now if the saddle slot is angled back 8° to 10°, the intonation is adjusted as the action is changed.

Does truss rod affect intonation?

Intonation is mainly controlled from your bridge, but adjustments you make to your truss rod can affect intonation. The red line and arrow show how far the string needs to be pushed to reach the fret. A slight relief in the neck creates low action in the higher frets while preventing fret buzz in the lower frets.

Which way turns intonation screws?

If the 12th fret note is flat, move the saddle forward a little by turning the adjustment screw at the back of the bridge (counter-clockwise). If the 12th fret note is sharp, move the saddle back a little by turning the screw clockwise.

How does guitar intonation work?

Intonation refers to the instrument being in tune along the fretboard. An easy way to check the basic intonation of a guitar is to hit a 12th fret harmonic and compare the pitch with a note fretted at the 12th fret. If the fretted note is sharp, the string needs to be lengthened.

Why can I Intonate my guitar?

If the tops of your frets are too flat, dented, or you just had crappy fretwork done by a bad guitar tech, you can have trouble setting intonation. If this is the case, you'll probably have other issues too, such as fret buzz or notes fretting out. Overly flat frets can cause intonation issues.

What does intonation mean in singing?

Intonation means the way someone's voice rises and falls as they're speaking. The word also means "producing musical tones," either with your voice or a musical instrument. Another kind of intonation is chanting, or half-speaking, half-singing your words.

What is the correct height of guitar strings?

For electric guitars, in our opinion, a good default string height at the 12th fret is typically about 6/64th of an inch on the bass side and 4/64th of an inch on the treble side.

Do acoustic guitars need to be set up?

Yes, all guitars need to setup or adjusted over their lifetime. Intonation - tune up your guitar; preferably with a decent electronic tuner. Fret each string at the 12th fret (the notes at the 12th fret should be the same tuning). Buzz at any of the frets.

Do new guitars need to be set up?

Depending on where you purchase your guitar most guitars will need a setup. Aside from the variables that exist between players, most guitar companies will do a basic setup that will above all eliminate any buzzing frets.

Can old strings cause intonation problems?

Old strings affect intonation because they often wander off the proper tone. There is not much you can do about it by adjusting the string length, because as soon as you have the initial note right, the tired old string will wander off while swinging out, making everything you play sound sick.

What is a guitar setup?

So, what is a guitar setup? A guitar setup is a series of adjustments made to an electric or an acoustic guitar to ensure proper health and playability, and is considered “basic maintenance”. Performing a setup addresses changes a guitar goes through over time and returns it to its proper condition.

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