Trevi SX 507, 2-way, 2.0 channels, 20 W, 200 - 18000 Hz, 4 Ω, Black Trevi SX 507. Recommended usage: PC. Speaker type: 2-way, Audio output channels: 2.0 channels, Number of drivers: 2. RMS rated power: 20 W, Frequency range: 200 - 18000 Hz, Impedance: 4 Ω. Product colour: Black