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Amazon.com: Fluance DB10 10-inch Low Frequency Ported Front Firing Powered Subwoofer for Home Theater & Music : Electronics
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Amazon.com: Klipsch Reference R-121SW 12” Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers and an All-Digital Amplifier for Premium Sound in Black : Electronics
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