Amplifier: Vacuum tube system M20 Output Power: 35W/Each Frequency response: 20Hz~50KHz (1W Output)30Hz~30KHz(25W Power) S/N: 88.7dB (A–weighted) Amplifier Gross Weight: 8.1Kg (1 set) speaker Gross Weight: 18.2Kg Packing Size: 363 X 358 X 218mm Amplifier speaker Packing Size: 465 X335 X390MM speaker Speaker Unit: 1" + 5.25 " tube:M01A X 2 WY3P x 4