Wangine stereo power amplifier WPA-600 pro. Unit has been tested and fully operational. Unit has been recently serviced. Date of service will be found on the bottom of the unit. What has been done to the unit is as follows : Repaired the Speaker Protection Circuit . Replaced the Protection Relays. All pictures are original of this lot ad part of description so what you see is what you get ! Power output: 80 watts per channel into 8Ω (stereo) Frequency response: 5Hz to 100kHz Total harmonic distortion: 0.02% Damping factor: 100 Input sensitivity: 0.8V Signal to noise ratio: 110dB Speaker load impedance: 4Ω to 16Ω Dimensions: 422 x 120 x 295mm