Just as a point of interest,my KN7000 lost the right main speaker. My earphones work in stereo. My repairman told me I could have inserted a wrong plug to mute the speakers,and shorted out one side of the amp. He is a factory authorized technician.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact