MUZISHARE X7 Tube Amplifier Double High Pressure Rectifier Power Amplifier Ultra-linear/ Triode Mode. Specification: Rated output power: 25W + 25W (RMS triode mode), 45W + 45W (RMS ultra-linear mode) Harmonic distortion: 1% (1kHz) Frequency response: 15Hz30kHz (-1.5dB) Input sensitivity: 280mV; 520mV(pre in) Input impedance: 100KO Output Impedance: 4O 8O SNR: 92dB Output balance of the left and right.Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "outstandingdeal" and is located in this country: CN. This item can be shipped worldwide.