Kenwood KM-106 Humming Issue

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Hi everybody! I am pretty new to sound systems, but recently came across my dads old Kenwood system. I hooked everything up according to the schematic, but when I plug in speakers and power the amp on, I get this really loud humming sound. If I turn the music all the way up, I can hear it through the humming, but it definitely doesn't seem very loud at all. Anyone have any ideas on what could be the problem? Thanks!
 
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