sound reflectors and the projection of sound

Sound Reflectors and the Projection of SoundKaegan Gregory

Overview of Prior Research• Every concert hall is unbalanced• Acoustic engineers adjust acoustics in

concert hallso Sound shellso Sound Reflectors

• RCHS auditorium adjusted with sound reflectors• Tested low, middle, and high

frequencies

Procedure• Test acoustics

o Low medium high frequencieso 9 points in auditorium

• Develop wooden sound reflectorso test, and revise positions

• Develop plastic sound reflectorso test, revise positions

• Analyze datao Standard deviation of low medium high

frequencies, this value is then plugged into ANOVA

Data: Control• Auditorium proved to be unbalanced• Seemingly random data• Odd acoustic trend• Average decibel level: 74.9 (average

throughout auditorium)• Data was expected

• Position of 1st wooden reflectors

Data: Wooden Reflector (pos. 1)• Balance improved

o Still abnormalities in hot spots in auditorium, requiring further adjustment

• Data makes sense based on angles • Projected sound throughout auditorium• Average decibel level: 78

• Graph of standard deviation of trials between left, center, and right

• Position of 2nd wooden reflectors

Data: Wooden Reflector (pos. 2)• Balance further improved• Angles of reflection adjusted • Average decibel level: 77.5

• Graph of standard deviation of trials between left, center, and right

• Position of plastic reflectors

Data: Plastic Reflector • Balance improved to a standard

deviation of 1.36 (60% improvement from original)• Average decibel level: 76

• Graph of standard deviation of trials between left, center, and right

Analysis• When all trials are compared, no

significant differences. (p=.071)• When control was compared to any

trial, there were significant differences (p=.011)o Shows that adjustments caused sound to be

reflected almost certainly not by chance

What Does This Mean??• The sound reflectors proved to be a

practical solution for the RCHS auditoriumo Hot spots nearly eliminatedo more sound projectedo Materials fairly inexpensive

• Implementationo Beta testing (band/chorus)o Design improvemento Scaled enlargemento Suspension?

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