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Old School Polk Audio C4 Subwoofer - Four 6x9's in Isobaric Teardrop Enclosure — Polk Audio Forum
![Polk Audio Center Channel Speaker 18" Wide, Tested, Works! | eBay](https://i.ebayimg.com/images/g/L8UAAOSwMihgp-C4/s-l1600.jpg "Polk Audio Center Channel Speaker 18" Wide, Tested, Works! | eBay")
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