The normal sized circular sound hole on a steel string acoustic guitar is 4 inches across.  Making the sound hole smaller would tend to make the guitar have more bass.  Making the sound hole larger would accentuate the treble.

A lot of experimentation has been done lately putting the sound holes in different places on the sound board and also in different shapes.  The different shapes are sometimes just for visual effect but in addition, sometimes sound holes need to be made in different shapes or put in different places because the bracing pattern underneath the sound board has been changed.

The sound hole doesn't act like a speaker, it just allows the top to vibrate more freely by releasing air pressure inside the guitar body.

Gman ( o )==#   

   

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