AMPLIFIER HEAD FOR BASS 500w head at 4 Ohm, Class D. Class A preamp with 12AX7 tube. Ultralight, weight of 3.5Kg. Drive control to add distortion. Compressor for dynamics control. Equalization control: bass and treble, Shape and Frequency control. Brightness Selector, Output Mute Selector. Gain and Master Volume. Passive and active inputs, XLR balanced pre/post direct output, Jack/Speakon speaker output. 1/4'' Jack Tuner Output, Effects Loop.