Functions:1. With 15 kinds of DSP effects variety be changed, and it can be adjusted automatically according to the client's demand.2. 6 channel microphone input with unattached modulation, it can connect to the musical signal input from band.3. With original import reverberation integration and perfect speaker protect function, timbre adjust function is predominant.4. Adjust 8 power tube imported from American as magnifying current. Front and back Power supply is independently. 5. It can adjust nice timbre with 9 segments frequency equalizer.specificatons:Output Power: (A) 420W+420W (B) 400W+400WFrequency Response: 20Hz-20KHzSignal to Noise Ratio: 77dBSeparation:55dBT.H.D.:<0.16% 1KHzPower Requirements: AC220V/50HzWeight:19.3KgDimensions: (LxHxW) (cm) 43x20x41.5