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Subwoofers (and the air itself!) are NOT in-phase with your mixer and amplifier.

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BIC Formula F-12 Subwoofer - OfferUp $160 - MSRP - $479

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Anthony Gallo Nucleus 5.1 Home Theater - OfferUp $400 - MSRP ~ $2,300

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Amazing Manufacturing Bass Subwoofer - Making Of Speakers - Factory Tour -How To Make Speakers

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Sunfire MK4 Subwoofer Repair

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A Look Inside The ELAC Debut 3.0 DB63 Speaker - All this for only $449?!

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The Monolith THX 10 Subwoofer is MORE THAN ENOUGH for Most People

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Extreme HiFi