Visaton FR 10. Driver size: 101.6 mm (4 "). RMS rated power: 30 W, Peak Music Power Output (PMPO): 50 W, Frequency range: 80 – 20000 Hz. Diameter: 100 mm, Weight: 0.38 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 127.5 x 127.5 x 47 mm, Audio output channels: 1.0