Some instruments come in more than one style (mandolins may have F-holes, round or oval holes). A round or oval hole or a rosette is usually a single one, under the strings. C-holes, D-holes and F-holes are usually made in pairs placed symmetrically on both sides of the strings. Most hollowbody and semi-hollow electric guitars also have F-holes.
Though sound holes help acoustic instruments project sound more efficiently, sound does not emanate solely from the sound hole. Sound emanates from the surface area of the sounding boards, with sound holes providing an opening into the resonant chamber formed by the body, letting the sounding boards vibrate more freely, and letting vibrating air inside the instrument travel outside the instrument.
In 2015, researchers at MIT, in collaboration with violin makers at North Bennet Street School, published an analysis that charted the evolution and improvements in effectiveness of violin F-hole design over time.
Some Ovation stringed instruments feature a particularly unique soundhole architecture with multiple smaller soundholes that, being combined with a composite arch-top guitar body are said to produce a clear and bright sound.
Tacoma Guitars has developed a unique "paisley" soundhole placed on the left side of the upper bout of their "Wing Series" guitars. This is a relatively low-stress area that requires less bracing to support the hole.
B&G Guitars, a private build guitar company from Tel Aviv, Israel, uses their signature "backwards" sound holes on their guitars
Holes not positioned on the top of an acoustic guitar are called soundports.They are usually supplementary to a main soundhole, and located on an instrument's side facing upward in playing position, allowing players to monitor their own sound.
Single F-Hole on a Fender Telecaster Thinline guitar.
Leaf sound hole in an Ovation Adamas guitar.
Many acoustic guitars incorporate rosette patterns around the sound hole.
Maccaferri guitars have D or Oval shaped sound holes.
C-holes on a viol.
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