Featuring a unique construction, the Master & Dynamic MA770 speaker designed in collab with Sir David Adjaye is made with an acoustically engineered proprietary concrete composite, with audio courtesy of two 4-inch woven Kevlar long throw woofers and a 1.5-inch titanium tweeter tuned to offer rich, clear, expansive sound that fills any space. A self-centering stainless steel grille is included to protect the speaker's components.