Does How You Hold Your Guitar Affect the Sound? *
|Areas of Science||
|Time Required||Average (6-10 days)|
|Prerequisites||You must have an acoustic guitar and a personal computer with a microphone, or a tape recorder with a visual display of input signals.|
|Material Availability||Readily available|
|Cost||Very Low (under $20)|
AbstractWhat do a guitar, a piano, a harp and a violin have in common? Turns out a couple of things, including a soundboard. All stringed instruments use a soundboard to amplify (greatly increase) the volume of the sound coming from vibrations of the strings. The soundboard is positioned so that it gathers the sound vibrations coming from the strings and then retransmits them at an even greater volume when it begins to vibrate. Soundboards are common in the world of musical instruments, but they can even be found in nature. Did you know that you can hear the chirps of little black crickets at night thanks to small soundboards built right into their bodies? Yes, to increase the volume of their chirps, the crickets lift their wings to a 45-degree angle, creating a soundboard!
In this music science fair project, you will investigate how positioning affects the ability of a soundboard to transmit sound. In certain positions there is more damping of the soundboard, which results in a lower amplitude of sound. You will need a personal computer, either laptop or desktop, with a built-in microphone; or a tape recorder with a visual display of incoming signals. If you are using a personal computer, the Bibliography provides a link to free software that will allow you to look at and compare your sound recordings. You can choose any instrument with a soundboard to do your testing, but general instructions are given here for an acoustic guitar:
- Sit in a chair a few feet away from the microphone with your guitar.
- Hold the guitar snugly so that the back of the guitar body is making contact with your chest and stomach, and strum a chord several times. Pay attention to how hard you are strumming, and try to strum with the same force each time. Record or observe the amplitude of the signal.
- Now hold the guitar in the "folk position" (also called "casual position") with the bottom of the body resting on your right thigh, and your right forearm and upper right chest contacting the top part of the guitar's body. There should be about 6 inches of space between the soundboard and your torso so that the soundboard can vibrate. Strum the same chord several times again, with approximately the same force as the first time, and record or observe the amplitude of the signal.
- Now hold the guitar in the "classical position" with the bottom of the body resting on your left thigh, your left foot elevated with a foot stool or books, and your right forearm resting on the top of the body. Tilt the body of the guitar back until it contacts your chest. Again, there should be about 6 inches of space between the soundboard and your torso, so that the soundboard can vibrate. Strum the same chord several times with approximately the same force as the first time, and record or observe the amplitude of the signal.
In which position do you have the least contact with the guitar's soundboard? Which position produced the greatest amplitude of sound?
Cite This PageGeneral citation information is provided here. Be sure to check the formatting, including capitalization, for the method you are using and update your citation, as needed.
Last edit date: 2019-04-11
This source describes how soundboards work:
- Wikipedia Contributors. (2008, October 8). Sounding board. Wikipedia: The Free Encyclopedia. Retrieved October 14, 2008, from http://en.wikipedia.org/w/index.php?title=Sounding_board&oldid=243898620
This video link shows the folk and casual guitar positions:
- GuitarLessons YouTube Channel. (2009, July 10). How to Hold An Acoustic Guitar—Guitar Lessons. Retrieved April 11, 2019 from https://youtu.be/RTR12eM1-Xc
This link provides free "open-source" software with the capability for looking at and editing sound signals:
- Audacity Developer Team. (2000, May). The Free, Cross-Platform Sound Editor. Retrieved October 16, 2008, from http://audacity.sourceforge.net/
News Feed on This Topic
Ask an ExpertThe Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.
Ask an Expert
If you like this project, you might enjoy exploring these related careers:
Sound Engineering TechnicianAny time you hear music at a concert, a live speech, the police sirens in a TV show, or the six o'clock news you're hearing the work of a sound engineering technician. Sound engineering technicians operate machines and equipment to record, synchronize, mix, or reproduce music, voices, or sound effects in recording studios, sporting arenas, theater productions, or movie and video productions. Read more
PhysicistPhysicists have a big goal in mind—to understand the nature of the entire universe and everything in it! To reach that goal, they observe and measure natural events seen on Earth and in the universe, and then develop theories, using mathematics, to explain why those phenomena occur. Physicists take on the challenge of explaining events that happen on the grandest scale imaginable to those that happen at the level of the smallest atomic particles. Their theories are then applied to human-scale projects to bring people new technologies, like computers, lasers, and fusion energy. Read more
News Feed on This Topic
Looking for more science fun?
Try one of our science activities for quick, anytime science explorations. The perfect thing to liven up a rainy day, school vacation, or moment of boredom.Find an Activity
Explore Our Science Videos
Build a Gauss Rifle
Make a Homemade Fly Trap
DIY Glitter Surprise Package with a Simple Circuit