Electric Performance Index Output Power:24W + 24W(THD=5 %) Frequency Response:10Hz--64KHz(-2dB) Distortion Degree :≤1.0% SNR:≥94dB(A) Input Sensitivity:≤300mV Power Consumption of the largest:≤142w Load Impedance:4Ω - 8Ω Tube:L:300B x 2 Russia 6H8C x 1 Russia 6H9C x 1 5Z3P x 1 R:300B x 2 Russia 6H8C x 1 Russia 6H9C x 1 5Z3P x 1 Size:W:29.5 cm H:22 cm L:39 cm (Single) N/W:15 kg(Single) G/W:18 kg(Single)