Philips CSS2113, 2.0 channels, 60 W, 4 Ω, 3.81 cm (1.5"), 12.7 cm (5"), Passive subwoofer Philips CSS2113. Audio output channels: 2.0 channels, RMS rated power: 60 W. Impedance: 4 Ω, Tweeter diameter (imperial): 3.81 cm (1.5"), Woofer diameter (imperial): 12.7 cm (5"). Subwoofer type: Passive subwoofer, Subwoofer frequency range: 20 - 150 Hz, Subwoofer impedance: 8 Ω. Product colour: Grey. Connectivity technology: Wireless