The Sub Utopia EM is the last building block of the Utopia range and the logical follow-up to the ultimate multi-channel reference speaker; Viva Utopia. With this subwoofer, Focal focused all its know-how on an entirely passive design, based around a 13-inch Electromagnet woofer, that appeared with the Grande Utopia EM. An ideal complement to the Viva Utopia, this subwoofer can be used with any model of the range, including the Grande Utopia EM. Its secret? A clever stackable design (up to 3 subwoofers tall) that can answer even the most demanding power needs. The unequaled punch of EM technology, with the refinement and finesse of Utopia.