Altec Lansing VS4221 Multimedia Speaker System, Silver/Black. Mid-range driver size: 28 mm. RMS rated power: 35 W, Frequency range: 40 - 20000 Hz, Sensitivity: 98 dB. Type: TV/Monitor speakers, Audio output channels: 2.1, Subwoofer dimensions (WxHxD): 200 x 245 x 340 mm