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At US$150, the Polk Audio SWA500 subwoofer amplifier is a strong deal, sitting well below the 25th percentile of US$128 in our database of 52 recent listings and far under its original MSRP that likely exceeded US$300. This price is 17% below the median of US$191, making it an attractive bargain for a buyer seeking solid low-end extension without the retail premium.
The SWA500 is well-regarded for its clean, punchy bass and reliable built-in power amp, a favorite among Polk system owners for upgrading entry-level setups. At this price, it offers meaningful upside for anyone wanting to add dedicated sub bass without spending big, especially if it’s in original-owner condition or includes the power cord and manual. Unless the listing flags a known failure like a blown amp or missing grille, this is a clean buying opportunity for a well-loved, functional piece of hi-fi history.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Polk Audio emerged in 1972 from the inventive spirit of three Johns Hopkins University graduates—Matthew Polk, a physics major, George Klopfer, and Sandy Gross—in Baltimore, Maryland. What began as a modest venture building public address systems for local events evolved into a dedicated speaker company after an initial contract fell through, leaving the founders to sell their redesigned cabinets directly. Fueled by passion for music and hi-fi innovation, they secured Small Business Administration loans, relocated operations, and rapidly scaled production, hitting $1 million in revenue by 1976 and earning a spot on Inc. magazine's list of America's fastest-growing private companies.
The brand has long focused on loudspeakers as its cornerstone, pioneering models like the Monitor 7 series for balanced dynamics, deep bass, and high-volume performance that bridged European refinement with American power. Polk expanded into automotive audio through partnerships like MOMO in 1999, while maintaining a core lineup of home speakers, including innovative SDA technology for enhanced soundstaging. Though not delving into amplifiers, turntables, DACs, headphones, or cables, their emphasis remains on reliable, high-fidelity transducers engineered for generations-spanning accuracy.
Polk Audio holds a solid mid-tier position in the hi-fi market, prized by enthusiasts for value-driven performance sold through specialty stereo shops and big-box retailers like Best Buy. Once publicly traded on NASDAQ in 1986 before going private in 1999, the brand now operates under Sound United, upholding its legacy of accessible excellence without chasing ultra-high-end exclusivity or vintage obscurity.
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