One of my acoustics has a bit of buzzing apparent on the 3d, 4th and 5th and 6th strings when I play them lower down the fret board. It's not fret buzz, and seems to be coming from further up the neck a little after I play the note.
It's barely apparent when I fingerpick normally (I have a fairly light touch), but if I dig in or use a pick (especially hard strumming) it's there.
I did have the guitar strung with 11's but restrung it with 12s today which is what it had when i bought it I think. The buzz is about the same with both gauges.
Does it sound like the truss rod needs a tweak?
Comments
If you fret the D string at the first and 14th frets (using both hands!) - there should be a gap between the bottom of the string and the 7th fret of about the thickness of the high E string.
If it is less than this, or there is no gap, the rod needs loosening.
Turn it anti-clockwise (using the correct tool), a sixth of a turn at a time and recheck after each adjustment.
I've had it 8 years so far without it needing anything doing so it's about time.
It's the guitar equivalent of topping up the oil in your car.
As long as you have the right sized hex-key and proceed gently as I outlined, you'll be fine. Trust me, unless you mindlessly crank away at the thing, there is NO risk of damage. As I've said before, most major manufacturers supply keys with their guitars - if there was a real risk of breaking something, they wouldn't do this.
I've never had the truss rods on any of my guitars adjusted by anyone other than me (from a £20 Japanese acoustic in the 70s, through to vintage Fenders, Gibsons, PRSs, etc).
Give it a go. I recently replaced the inlet and flush valves in a toilet without bringing any ceilings down. I felt like Billy Big Bollocks!
I am reasonably handy so in theory I could try.