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Acoustic guitar acoustics
Old 17th November 2009
  #1
Gear Maniac
 

Acoustic guitar acoustics

While I have been in the recording arts for quite a while I have a new found interest in building acoustic guitars (steel string). I have tried to apply what I know in terms of recording and acoustics to the acoustic guitar. One of the newer trends in higher end guitars is the sound port. A small about 3" dia port located on the side of the guitar at the upper bout. To my knowledge no one has explained the effect of this as far as the sound goes. I most guitars it increases the over all volume to the player with minimal if any change to the front projection of the guitar.

Just curious for the acousticians here do you think this is the same effect as a ported speaker cabinet? If so exactly how does that work? Or is the upper bout(corner) of the guitar acting as a basstrap?

Any thoughts would be appreciated

Richard
Old 17th November 2009
  #2
Gear Maniac
 

here is a pic of the port
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Acoustic guitar acoustics-img25.gif  
Old 17th November 2009
  #3
Lives for gear
 
andrebrito's Avatar
I think this acts as a bass port reflex as in a loudspeaker.

Wiki explains better than I do... without formulas lol
Old 22nd November 2009
  #4
Gear Guru
Helmholtz

Guitars are only an octave above Bass. They are physically a bit small to support such low frequencies. So, in order to get some bottom end they are designed to broadly resonate at around 90-110Hz. Thump one gently and you will hear it. The hole size is part of what determines the frequency and bandwidth of resonance. A couple of smaller holes will do the same thing. Bass is not really directional. Furthermore there is a bit of string tone bouncing around inside, so this hole is probably quite and effective musician monitor. This is an interesting guitar idea, the single hole in front causes quite a boom exactly where we want to put the mic. Maybe distributed holes will lessen this probem.
DD
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