Artsound AS20 B. Tweeter size: 25.4 mm, Mid-range driver size: 50.8 mm, Woofer size: 76.2 mm. RMS rated power: 30 W, Peak Music Power Output (PMPO): 60 W, Frequency range: 150 - 20000 Hz. Weight: 2250 g. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 90 x 88 x 150 mm, Audio output channels: 2.1