Visaton FR 6.5. Driver size: 165.1 mm (6.5 "). RMS rated power: 40 W, Peak Music Power Output (PMPO): 60 W, Frequency range: 70 – 20000 Hz. Diameter: 150 mm, Weight: 0.47 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 171 x 171 x 59 mm, Audio output channels: 1.0