The normal sized circular soundhole on a steel string acoustic guitar is 4 inches across. Making the soundhole smaller would tend to make the guitar have more bass. Making the soundhole larger would accentuate the treble.
A lot of experimentation has been done lately putting the soundholes in different places on the soundboard and also in different shapes. The different shapes are sometimes just for visual effect but in addition, sometimes soundholes need to be made in different shapes or put in different places because the bracing pattern underneath the soundboard has been changed.
The soundhole doesn't act like a speaker, it just allows the top to vibrate more freely by releasing air pressure inside the guitar body.
Bob, Gman ( o )==#
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