Honors Theses
Date of Award
Spring 5-1-2021
Document Type
Undergraduate Thesis
Department
Electrical Engineering
First Advisor
Paul Goggans
Second Advisor
Elliott Hutchcraft
Third Advisor
Barry Muldrey
Relational Format
Dissertation/Thesis
Abstract
A dynamic loudspeaker mounted in an open baffle has the same parameters as a loudspeaker in free space. A subwoofer mounted in an open baffle has a small total quality factor and therefore the frequency above which the driver has a significant output is too high despite the subwoofer's low resonant frequency. To address this issue, we implemented a motional feedback circuit with the goal of introducing both velocity feedback and acceleration feedback into the loudspeaker system and thus altering the resonant frequency and total quality factor of the system. After verifying the efficacy of our feedback circuit with computer simulations, we first tested it using a Sallen-Key highpass filter to model the power amplifier, loudspeaker, and accelerometer and we were able to obtain desired results. We then connected the motional feedback circuit to our loudspeaker and collected pertinent testing data. While this data was not perfect due to noise within the circuit we are able to see the effects of the feedback circuit on the frequency response of the loudspeaker and get velocity and acceleration responses that we were looking for.
Recommended Citation
Quinlivan, Matthew and Harvie, William, "An Open-Baffle Motional Feedback Loudspeaker" (2021). Honors Theses. 1837.
https://egrove.olemiss.edu/hon_thesis/1837
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