Philips SPA9300 Multimedia Speaker 2.1, 2.1 channels, 50 W, Universal, Black, Silver, 100 W, 2 m Philips SPA9300 Multimedia Speaker 2.1. Audio output channels: 2.1 channels, RMS rated power: 50 W, Recommended usage: Universal. Subwoofer driver diameter (imperial): 20.3 cm (8"). Power source: AC, AC input voltage: 220 V, AC input frequency: 50 Hz. Connectivity technology: Wired, Line-in connectivity: 3.5 mm. Master (outer) case gross weight: 17.9 kg