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The new "X" line of M&K Sound subwoofers consists of three models: the X8, X10, and X12. When asked how the new "X" line subwoofers were different from the previous generation, Claus Glaesner, President of M&K Sound USA, replied, "These subwoofers are a major step up in every way from our previous subwoofers. The build quality, driver quality, and sound quality represent a new reference level of subwoofer that was previously not available on the market."