Originally posted by: Fritzo
Originally posted by: Fritzo
Maybe you're getting fret buzz? At the 12th fret, you would get a natural harmonic, giving you a double tone, which could in fact make the note sound louder.
Try adjusting your string height up a bit to see if that fixes it.
I happened to run into my good friend Fred the luthier at a Steelers party yesterday (we won! Woohoo!). Fret buzz is the first thing he would check for if this is happening. I'm smarter than I look
🙂
Did the guy ever mention if he is using an amp or not?
OP, is this happening acoustically or just when you are plugged into an amp?
If acoustically, then yes, you need to consider what Fritzo is saying. There's a direct physics answer to why it could be happening at the 12th fret. Example. Look at the bridge and nut of the guitar (the full distance of the string that actually vibrates), where is the 12th fret in regards to the full distance? It's exactly the center. Where is the 24th fret (if you have one) in regards to the distance between the 12th fret and the bridge? Exactly the center. That's how you create an octave, and why the natural harmonic happens. You are essentially cutting the length of the string in half. If the open string vibrates at a pitch of 440Hz, the 12th fret will be 880hz, the 24th fret 1760hz.
If the distance of the full open string was a mile, then from the 12th fret to the bridge, it would be a half mile, 24th fret, a quarter mile.
That exact division causes some pretty interesting harmonic properties.
However, if it only happens when you use an amp, it could be a combination of EQ, (too much treble which could be spiked in the frequency range that would result in amplifying the frequencies around the 12th fret). How precise that is would depend on teh slope and Q of the eq.
If the eq is flat, check the tone/bass/treble knobs on your guitar, make sure those are flat too. If it still happens (and it doesn't happen acoustically without an amp), it's most likey the pickup resting higher towards the high e string vs the rest of the strings. However, I think in that scenario the volume change wouldn't be so difinitive at teh 12th fret, but throughout the entire string.
just my two cents.