Altec Lansing Expressionist Ultra. Tweeter size: 22 mm, Woofer size: 165 mm. RMS rated power: 200 W, Frequency range: 2500 - 20000 Hz, Signal-to-Noise Ratio (SNR): 75 dB. Connectivity technology: Wired, Headphone connectivity: 3.5 mm. Audio output channels: 2.1, Subwoofer dimensions (WxHxD): 260 x 382 x 400 mm, Surround speaker dimensions (WxHxD): 135 x 156 x 220 mm