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http://www.merchantcircle.com/blogs/article-phoenix-az/2016/3/How-it-all-started-About-Guitar-Speakers/1310309

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https://medium.com/@lamoosh123/the-biggest-launch-of-the-century-about-guitar-speakers-36cb3f2f5ad5#.v6cv4hjts

https://slashdot.org/submission/5720473/how-it-all-started-about-guitar-speakers