Includes 4 Definitive Technology DI 5.5R 5.25 inch In Wall In Ceiling Speakers. With its small diameter, hidden flange design, and low profile grille, the DI 5.5R is nearly invisible in your ceilings or walls. This pint size dynamo goes boldly where other speakers cant, while producing a full, accurate audio experience belying its size. The ultralight, rigid construction of DI Series aluminum dome tweeters enables them to play significantly higher frequencies than we can hear, enabling optimum linearity within the range of human hearing. The DI 5.5R features a pivotable tweeter for clean, sparkling, distortion free highs, with dispersion customizable to your space. For more bass in less space while keeping midrange detailed and responsive, the DI 5.5Rs 5.25 inch mid bass woofer leverages our exclusive Balanced Double Surround System driver technology. Whether new or existing construction, walls or ceilings, residential or commercial, DI Series speakers offer simple, stealthy installations. Our engineers have extensive custom installation experience, and have felt your pain when working with hastily engineered products. From pivoting lock arms to paintable grilles and frames to sure grip magnetic grille fasteners, DI Series speakers are installer friendly to the extreme.