Product name: Vacuum tube amplifier and speakers testing technical data ModelT01 System Vacuum tube amplifier Into the impedance47KΩ Output Power15W×2 Output Impedance4Ω Harmonic distortion≤1% Frequency response20Hz 22KHz ±0.5dB S/N88dB (A – weighted) tubeT01 Sensitivity550mV power AC220V-50-60HZ Packing Size amplier 260×280×180mm Packing Size speaker 280×200×268mm Net Weight16.1Kg After-sales service: We are committed to long-term after-sales service, the success of which is reflected by the many customers who stay with us year after year. Our warranty and return policy: All new amplifier or speaker purchases come with 1 year warranty covering any manufacturing defects.