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Amazon [amazon.com] has 8" Denon Bass-Reflex Home Subwoofer w/ HEOS Built-In : Pair with Denon Home Sound Bar 550, and Denon Home 150/250/350 Speakers or HEOS Speakers for $ 349. Shipping is Free.
8″ Denon Bass-Reflex Home Subwoofer w/ HEOS Built-In $349 + Free Shipping