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The SVS 4000 Series subwoofers destroy all preconceptions of reference subwoofer performance and technology by producing massive bass. Using the trickle-down technology from the 16-Ultra Series, which has been named the best subwoofers in the world by nearly every audio publication and industry group, the 4000 Series erases expectations and delivers an unparalleled level of subwoofer performance only available from SVS. Earth-shattering SPLs, stunning deep bass extension, precise regulation and accuracy with advanced control; all the hallmarks of a reference subwoofer are found in the SVS 4000 Series.