KEF C7 Floor Standing Speaker - Black (Single) 2-way bass reflex floor standing speaker 19-millimeter (0.75-inch) aluminum tweeter, 2 x 165-millimeter (6.5-inch) mid-range/bass drivers Highly rigid cabinet is vented by a contoured front port to enhance bass reproduction Features KEF's "tangerine" waveguide for smoother, clearer high frequency response Sold as a single speaker