... price,support sell in group with musical instruments. Professional USB multi Speaker muscial instruments amplifierModel : M2600-210 ... : 2x10inches+1x6.5inches FunctionElectric guitar channel treble,bass independent proportional-plus-floating control. Electric shell department ... control. 3 group microphone inputs, microphone treble ,bass,reverberation depth, reverberation speed regulation. 2 road ...