Patent pending design, with directivity control derived from Perlisten's DPC, creating a frequency response that matches world class speakers. Featuring the same Silk dome tweeter and midrange, with Perlisten's custom paper pulp 6.5” woofers as their in-walls and highly regarded in-room speakers. This enables a flat frequency response angled for 30 degree main listening window with off axis and power response to match Perlisten's R-series speakers for flawless timber matching needed for true immersive audio. A solid 4mm thick aluminum back box for consistent sound with limited sound transmission into other rooms. This ability to be used not only for in-ceiling surround but in-ceiling LCR or in-wall wide speakers and THX Certified Dominus for surrounds. Better coverage for even response across more seats with no compromises!