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Amazon.com: 10 Inch Car Subwoofer Speaker - 300 Watt High Powered Car Audio Sound Component Speaker System w/ 1.5 Inch Kapton Bobbin Voice Coil, 8 Ohm, 25 oz Magnet, Cloth Edge Suspension - Pyramid WH10,Black
Speaker Builder: The Pyramids By Rudiger Geppinger | audioXpress
Pyramid Shaped Boombox Stereo Speakers by Radio Shack Vintage - Etsy
pyramid speakers. 4 inch set in box model 4477 180 watts also included 2 speaker | eBay