Visaton DL 10. Driver size: 101.6 mm (4 "). RMS rated power: 20 W, Peak Music Power Output (PMPO): 30 W, Frequency range: 75 – 20000 Hz. Diameter: 100 mm, Weight: 0.4 kg. Operating temperature range (T-T): -40 - 110 °C. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 135 x 135 x 43 mm, Audio output channels: 1.0