The next level in-wall with Directivity control to even lower frequencies while enabling a DPC array and timbre matching not only in the raw materials but in the critical frequency response, power response, phase. In addition, the S5i is THX Dominus Center certified.  A true value in the medium size home theater in-wall compared to almost any in-wall on the market and can be utilized as a Center with an acoustically transparent screen or as a center near a screen in a Media room.