Sound Demo https://www.youtube.com/watch?v=KrKzLu7irJg Tuolihao Q4 HiFi Japanese enthusiast bookshelf audio passive the full-range speaker requires amplifier amplifier Brand: Tuolihao Model: Q4 full frequency Material: wood Impedance: 4 ohms Weight (g): 12 kg Speaker structure: inverted Speaker type: front Power: 60W Sensitivity: 89dB / mW