rbh sound

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    RBH's twin-21 sub costs $5,000 more, and the amps are not all included

    Most subwoofer comparisons come down to a few extra hertz and a slightly bigger box. This one does not. RBH's Unrivaled 21 is $11,945 for a single 21-inch carbon fibre driver in a sealed cabinet that weighs 371 pounds. The Unrivaled 221 starts at $16,945, puts two of those drivers in an...
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