# Sound hole

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Opening in the body of a stringed instrument

For parts of wind instruments, see [Tone hole](/source/Tone_hole).

The sound holes of [cellos](/source/Cello) and other instruments of the [violin family](/source/Violin_family) are known as F-holes and are located on opposing sides of the [bridge](/source/Bridge_(instrument)).

A **sound hole** is an opening in the body of a [stringed](/source/String_instrument) [musical instrument](/source/Musical_instrument), usually the upper [sound board](/source/Sound_board_(music)). Sound holes have different shapes:

- **Round** in flat-top [guitars](/source/Guitar) and traditional bowl-back [mandolins](/source/Mandolin);

- **F-holes** in instruments from the [violin family](/source/Violin_family), archtop mandolins and in [archtop guitars](/source/Archtop_guitar);

- **C-holes** in [viola da gambas](/source/Viola_da_gamba) and occasionally [double-basses](/source/Double-basses) and [guitars](/source/Guitars)

- **[Rosettes](/source/Rosette_(music))** in [lutes](/source/Lute) and sometimes [harpsichords](/source/Harpsichord);

- **D-holes** in [bowed lyras](/source/Byzantine_lyra).

Some instruments come in more than one style ([mandolins](/source/Mandolin) 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](/source/Hollowbody_electric) [electric guitars](/source/Electric_guitars) also have F-holes.

Though sound holes help [acoustic instruments](/source/Acoustic_instrument) project sound more efficiently, sound does not emanate solely from the sound hole. Sound emanates from the [surface area](/source/Surface_area) of the sounding boards, with sound holes providing an opening into the [resonant chamber](/source/Acoustic_resonance) formed by the body, letting the sounding boards [vibrate](/source/Oscillation) more freely, and letting vibrating air inside the instrument travel outside the instrument. The F-holes in the violin family instruments also serve the purpose of enabling a [luthier](/source/Luthier) to use specialized tools to adjust the [sound post](/source/Sound_post) inside the instrument.

In 2015, researchers at [MIT](/source/Massachusetts_Institute_of_Technology), in collaboration with [violin makers](/source/Luthier) at [North Bennet Street School](/source/North_Bennet_Street_School), published an analysis that charted the evolution and improvements in effectiveness of violin F-hole design over time.[1][2] One of the conclusions of this paper was that acoustic conductance (air flow) is proportional to the length of the perimeter of the sound hole and not the area. They proved this mathematically, and showed how it drove the evolution of shape of the F-holes in the violin family. The highest air flow in a violin's F-hole are the places at the top and bottom where the points nearly touch the other side. The effect is analogous to putting one's thumb over the end of a hose to accelerate the water coming out. By this measure, the open round hole of a flat-top acoustic guitar is not very effective.

## Alternative sound hole designs

Some [Ovation](/source/Ovation_Guitar_Company) stringed instruments feature a particularly unique sound hole architecture with multiple smaller sound holes that, being combined with a [composite](/source/Composite_material) bowl back body, are said to produce a clear and bright sound.

[Tacoma Guitars](/source/Tacoma_Guitars) has developed a unique "paisley" sound hole 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.[3]

A few hollowbody or semi-hollow [electric guitars](/source/Electric_guitar), such as the [Fender Telecaster Thinline](/source/Fender_Telecaster_Thinline) and the [Gibson ES-120T](https://en.wikipedia.org/w/index.php?title=Gibson_ES-120T&action=edit&redlink=1), have one f-hole instead of two, usually on the bass side.

B&G Guitars, a private build guitar company from Tel Aviv, Israel, uses their signature "backwards" sound holes on their guitars.[4]

Holes not positioned on the top of an [acoustic guitar](/source/Acoustic_guitar) are called **soundports**. They are usually supplementary to a main sound hole, and are located on an instrument's side facing upward in playing position, allowing players to monitor their own sound.[5]

### Gallery

		- F-holes on a [Gibson L-5](/source/Gibson_L-5) [archtop guitar](/source/Archtop_guitar)

		- Single F-Hole on a [Fender Telecaster Thinline](/source/Fender_Telecaster_Thinline) guitar

		- Leaf sound hole in an [Ovation Adamas](/source/Ovation_Guitar_Company) guitar

		- Many acoustic guitars incorporate [rosette patterns](/source/Rosette_(design)) around the sound hole.

		- [Maccaferri guitars](/source/Maccaferri_guitar) have D or oval shaped sound holes.

		- Unique Sound Hole with [Chinese character](/source/Chinese_character) [龙](https://en.wiktionary.org/wiki/%E9%BE%99) by Cc Guitar [\[1\]](https://commons.wikimedia.org/wiki/File:Cc_guitar_acoustic_electric_calligraphy_series_dragon.jpg)

		- C-holes on a [viol](/source/Viol)

		- Two [Morin Khuurs](/source/Morin_Khuur) with two F-holes

## References

1. **[^](#cite_ref-1)** ["Power efficiency in the violin"](https://news.mit.edu/2015/violin-acoustic-power-0210). *MIT News | Massachusetts Institute of Technology*. 10 February 2015.

1. **[^](#cite_ref-2)** Nia, Hadi T.; Jain, Ankita D.; Liu, Yuming; Alam, Mohammad-Reza; Barnas, Roman; Makris, Nicholas C. (March 8, 2015). ["The evolution of air resonance power efficiency in the violin and its ancestors"](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4353046). *Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences*. **471** (2175) 20140905. [Bibcode](/source/Bibcode_(identifier)):[2015RSPSA.47140905N](https://ui.adsabs.harvard.edu/abs/2015RSPSA.47140905N). [doi](/source/Doi_(identifier)):[10.1098/rspa.2014.0905](https://doi.org/10.1098%2Frspa.2014.0905). [PMC](/source/PMC_(identifier)) [4353046](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4353046). [PMID](/source/PMID_(identifier)) [25792964](https://pubmed.ncbi.nlm.nih.gov/25792964).

1. **[^](#cite_ref-3)** Salter, Trent (2004-04-13). ["interview with Leith Anderson"](https://web.archive.org/web/20040413010556/http://www.musicianshotline.com/archive/interviews/tacoma_guitars.htm). Archived from [the original](http://www.musicianshotline.com/archive/interviews/tacoma_guitars.htm) on 2004-04-13.

1. **[^](#cite_ref-4)** ["B&G Guitars"](https://www.bngguitars.com/). *B&G Guitars*.

1. **[^](#cite_ref-5)** ["Q. What is the effect of the soundport? | Shelley D. Park Guitars :: Gypsy Jazz Guitar Luthier in the Style of Selmer Maccaferri"](https://web.archive.org/web/20080515125503/http://www.parkguitars.com/q-soundport-effect/). May 15, 2008. Archived from [the original](http://www.parkguitars.com/q-soundport-effect/) on 15 May 2008.

## External links

- [Stringworks U](https://web.archive.org/web/20051013054747/http://www.stringworks.com/instrument_construction.htm) - brief explanation of the effects of sound holes, with a closeup diagram of an F-shaped soundhole

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Adapted from the Wikipedia article [Sound hole](https://en.wikipedia.org/wiki/Sound_hole) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sound_hole?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.