KEF Ci50R. System type: single speaker, Recommended usage: speaker set unit, Speaker placement: In-wall/in-ceiling. RMS rated power: 30 W, Frequency range: 125 - 20000 Hz, Impedance: 6 Ом. Amplifier output power: 30 W. Connectivity technology: Wired. Width: 55 mm, Depth: 90 mm, Height: 80 mm