The Entry Level #28 | Stereophile.com
PSB Subsonic II 12 inches Powered Active Subwoofer (Sold)
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PSB subsonic II 12-inch Powered Active Subwoofer (300 Watts), Made in Canada!, Audio, Soundbars, Speakers & Amplifiers on Carousell
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PSB SUB SERIES 100 - SUBWOOFER, buy at Jamsticks.com
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PSB SubSeries 450 Subwoofer Review | Sound & Vision
PSB Speakers Alpha SubSonic 5 Subwoofers user reviews : 4.3 out of 5 - 29 reviews - audioreview.com
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6moons audio reviews: PSB B6
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