Dual 4″ In-wall LCR 2-way pancake powered by Sonic Vortex Our Sonic Vortex technology generates rich, deep bass and effortless clarity from what most people would call a ‘back box’, but is not. It is actually a compact, integrated tuned enclosure. This patented technology is a ‘twist’ on Ported Transmission Line design, that optimizes air movement to produce astonishing sound. The enclosure also keeps sound from bleeding to other rooms while adding 6 to 9dB boost in mid-lower bass. Features Speaker Type– In-Wall 2-Way Woofer– Dual 4″ Fluted Injected Polypropylene Tweeter– 1″ Aluminum Dome Frequency– 62 Hz – 24 kHz Sensitivity– 92db Butyl Rubber Surround Sonic Vortex Ported Transmission Line Magnetic Bezelless Grille– White; paintable Impedance– 6Ω Connector Type– Gold Spring Push Terminal Depth– 2.82″ (71.5mm) Speaker Weight– 6 lbs (2.72kg) Cutout– 18.31″ H x 8.74″ (465mm x 222mm) Grille Dimensions– 19.62″ H x 10.06″ W (498mm x 255.4mm) Frequency/Crossover Setting– Full range only Power Handling– 5-120W EZBracket Size– Does not apply Highlights– Ultra Shallow Depth Pancake Less than 3″ Depth (71.5mm)