Specifications: Maximum output: 12W+12W (pure class A) for high-quality sound Frequency response: 15Hz-40kHz (±1.0dB) for wide audio range Total harmonic distortion: 0.1% or less (1kHz) for clear, undistorted sound SN ratio: 88dB for excellent signal-to-noise performance Input sensitivity: 0.7V for compatibility with various audio sources Vacuum tubes used: KT88 x2 / 12AX7 (ECC83) x2 for high-performance audio amplification Input terminals: 3 systems (LINE1/2/3) for flexible connections A reliable and high-performance piece of audio equipment, designed for those who appreciate superior sound quality. If that, please let us know within 3 days you got the item. We are located in Japan. It's our pleasure to make you happy by proposing our recommend item. If you have any questions or request about items, please feel free to ask us.