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Polk Audio - Wikipedia
https://en.wikipedia.org/wiki/Polk_Audio#:~:text=With%20the%20release%20of%20the%20first%20successful%20model,mid%2Fbass%20drivers%20with%20rubber%20surrounds%20and%20passive%20radiators.
Polk Audio SDA Speakers: List of Vintage Models
https://polksda.com/list.shtml
Polk Audio, Inc. -- Company History
https://www.company-histories.com/Polk-Audio-Inc-Company-History.html
A Polk model using this design, the SDA-SRS-2, was priced at $1,990 per pair and measured 50 inches high by 20 inches wide. The late 1980s saw Polk fend off several attempts to unionize its workforce, as well as the departure from the company of Sanford Gross, who sold his 15 percent ownership stake.
POLK AUDIO Model: 10 Loudspeakers in Excellent Condition
https://polksda.com/ebay/Model10_5824875604.pdf
In 1972, Matthew Polk and his friend George Klopfer were graduates of Johns Hopkins University in Baltimore. They shared a love of music and high-end audio gadgetry, and both were of a certain scientific bent. That same year they began building loudspeakers, applying scientific design principles to speaker construction.
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