Artsound MD30. Woofer size: 76.2 mm. RMS rated power: 10 W, Peak Music Power Output (PMPO): 20 W, Frequency range: 76 - 15000 Hz. Weight: 750 g. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 105 x 45 x 105 mm, Audio output channels: 1.0