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How does the size of a speaker affect its frequency responseFeatured science projectScience project video

Abstract

This experiment was done to investigate how the frequency response of a speaker will change using different sizes of enclosure.

Hypothesis

 Reducing the size of the speaker enclosure will cause the dB of some frequencies to be higher compared to the rest of the frequencies.
 

Scientific Terms

Diaphragm, decibels, pressure

Background

Speakers

The speaker consists of an enclosure, a driver and a crossover. The speaker enclosure is normally made from hard wood like plywood or MDF (Medium Density Fiber). The enclosure will help to hold the speaker driver in place and also absorb the vibrations from the driver.
 

Speakers and frequency response science fair project

The diaphragm of the driver moves  back and forth to create sound. The forward movement of the diaphragm will cause the air pressure inside the enclosure to drop and the backward movement of the diaphragm will cause the pressure inside the enclosure to rise.
 

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Complexity level:
7
Project cost ($):
90
Time required:
2 days to prepare, 1 day for experiment
Material availability:
Easily found. May be purchased at a hardware store (eg. Home Depot)
Safety concerns:

None