... -Fi Power Amplifier 2, 2x18W 3, Frequency: 18Hz-50KHz 4, Warranty: 3 years Stereo Integrated With headphone amplifier HI-218 FEAUTUREHI ... -140 tube amplifier have reliable quality, best tone ... VoltageAC110V/220V 60Hz/50HzDimension430x400x330mmGross Weight20kg Naphon : Stereo Integrated With headphone amplifier HI-218