Hi. \nI have a Yamaha HTR-3064 5.1 Channel A\/V Digital Receiver along with sub woofer model no. NS-SW20.\n\nThe issue: The sub woofer turns ON but does not produce any bass \/ sound. \n\nChecks: \nCable between receiver and subwoofer is OK. \nExcept woofer all other speakers working OK.\nAll settings in the receiver are set to support woofer operation. \nWhen the audio cable ( between receiver & woofer) is removed from receiver end and is touched with finger, the woofer makes a humming sound\nvideo link \n\nCan anyone help me to identify the issue here ?