DELL AC411, 2.1 channels, 29 W, PC, Black, Amplifier, Built-in DELL AC411. Audio output channels: 2.1 channels, RMS rated power: 29 W, Recommended usage: PC. Amplification device type: Amplifier, Amplification device form factor: Built-in, Total Harmonic Distortion (THD): 10%. Satellite speakers RMS power: 14 W, Satellite speaker dimensions (WxDxH): 2.76 x 2.76 x 5.51" (70 x 70 x 140 mm). Subwoofer type: Active subwoofer, Subwoofer RMS power: 15 W, Subwoofer dimensions (WxDxH): 5.91 x 5.91 x 5.51" (150 x 150 x 140 mm). Power source: AC